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Ossan Hamster

Ossan Hamster

by Karol Staszewski · Published by Hamster Works

★ 100%
Price $1.79
Avg Players 0
Reviews 2
Released Apr 30, 2026
2DActionAction RoguelikeArcade
View on Steam ↗

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Ossan Hamster is a frantic action clicker that demands constant engagement rather than passive progression. You'll fight relentless enemy waves while managing energy reserves and timing special abilities to stay alive, making split-second decisions the difference between survival and defeat. Built for players seeking an active, skill-based challenge rather than an idle experience.

About this game

Players, last 39 days

Peak 0 · Low 0

Daily peak concurrent players, sampled once a night from Steam.

What players are saying

▲ Recommended 1 hrs
Best $2 ever spent. Addictive as hell. Harder than you’d think. Are you ready to take on the challenge?
Disclaimer: THIS IS NOT A GENERIC CLICKER GAME.
100% recommended.
2 found helpful Steam ↗

Reviews are by Steam users, hosted on Steam.

Latest updates

🛠️ Patch 1.6 – Leaderboard Rework, Co-op Improvements & Gameplay Polish

46 days ago
Hey!Patch 1.6 is here — focused on leaderboard scoring, co-op reliability, gameplay polish, controls, visual layering, and a large number of fixes and quality-of-life improvements.Thanks again for playing and sharing feedback.🏆 Score & Leaderboard ReworkLeaderboard scoring has been redesigned Ranking Score is now calculated as:Score − completed secondswith a minimum result of 0.Tiebreakers are now more precise If two players have the same Ranking Score, higher raw points are preferred, followed by a shorter completion time.Results now show more information The Game Over screen, Campaign menu, and Co-op lobby now display separately:Ranking ScorePointsTimeExisting Campaign and Co-op records are automatically migrated to the new format.Steam leaderboards now use the new Ranking Score system, allowing old raw-point records to be replaced by results using the new formula.Disconnected Co-op sessions can still save and submit their results.👑 Final Boss & Gameplay BalanceFinal Boss HP increased from 5,000 to 10,000.Final Boss encounters now scale properly in Co-op One boss appears per player, each targeting the correct hamster and beginning the fight from opposite sides.The total score reward is divided between the bosses, so Co-op does not provide extra score simply for spawning additional bosses.Market Mouse Robot now fires 3 projectiles instead of 1.Shielded Swamp Muskrat Basic is now slower until its protection is broken by the first hit.Energy MouseTrap fixed The energy variant now correctly removes 5 energy when triggered.Energy Tank interactions improvedIt can no longer be activated without valid targets.A new configurable keyboard shortcut can activate it directly.Poison level items can no longer be collected by clicking them. They remain an environmental mechanic intended for enemies.Ghost-form enemies now behave more consistently They are ignored by friendly drones and spirits, cannot trigger MouseTraps, and are unaffected by several player effects such as bombs a...

🛠️ Patch 1.5 – Mastery Mode, Online Co-op & Saved Builds

72 days ago
Hey!Update 1.5 is here — and this is the biggest update so far.This patch adds Mastery Mode, Steam online co-op, saved builds, the 15th upgrade row with ultimate skills, new arenas, Czech language support, and many gameplay, balance, and UI improvements.Thanks again for playing and sharing feedback.🏆 Mastery ModeAdded Mastery Mode Mastery is a new long-term progression mode with its own levels, tiers, arenas, mutators, run rewards, and permanent upgrades.Mastery starts from level 0 Progression is designed around gaining Mastery EXP and spending Mastery points on permanent upgrades.Added Mastery tiers 1–5 Each tier increases difficulty and rewards.Added 5 Mastery arenasBasement NestCable JunkyardSwampPortNeon NestAdded Mastery contracts A Mastery run can be completed by surviving for 10 minutes or reaching the tier score goal.Added Mastery mutators Mutators increase difficulty and EXP rewards, with effects such as swarms, stronger enemies, elites, damaged cables, energy leaks, and no rerolls.Added Mastery gifts during runs During Mastery runs, you can choose temporary gifts every 120 seconds, with different rarities and rerolls.Added permanent Mastery upgrades Spend Mastery points on long-term upgrades such as HP, damage reduction, energy, skill cost/cooldown, loot, EXP, and starting energy.Added Mastery leaderboard Mastery now has a leaderboard based on total EXP.🤝 Online Co-opAdded online co-op through Steam You can now create and join Steam rooms, invite friends, use passwords, ready up, and start co-op runs together.Added co-op arena selection The host can choose the mission or arena before starting.Added player setup before the run Players can choose skins and builds before the game begins.Added separate co-op records and leaderboards Co-op missions now have their own score records.Added separate player resources Each player has their own HP, energy, active skills, cooldowns, status effects, damage handling, and HUD.Added co-op elimination and revive mechanics W...

🛠️ Patch 1.4 – General Skills, Upgrade Rework & Cannon Control

111 days ago
Hey!Update 1.4 is here — this patch brings a major upgrade system expansion, new general skills, manual cannon control, new quality-of-life options, and several gameplay fixes.Thanks again for playing and sharing feedback.⭐ New General Skills SystemAdded a new General Skills system General skills are unlocked every 5,000 score and provide broader gameplay upgrades outside the regular upgrade skill rows.Gas Nova moved to General Skills Active Skill 6, Gas Nova, is now unlocked through a general skill instead of being granted automatically at 20,000 score.🌳 Upgrade Skill ReworkLarge part of the upgrade tree reworked and rebalanced Many upgrade skills were adjusted, moved, redesigned, or rebalanced.Added 4 new upgrade rows The upgrade tree now has 14 rows with 5 skills each, creating over 5 billion possible combinations.Upgrade score thresholds increased Skill unlock pacing was adjusted to better match the expanded tree.New Tools drop item added Picking up Tools reduces upgrade skill thresholds by 50 score.🎯 Hamster Cannon ControlAdded optional manual cannon control After enabling the option in the upgrade menu, hamster cannons can now be aimed manually with the right mouse button.Added cannon cooldown label Cannons now show a small label indicating time remaining until the next shot.⚖️ Gameplay & Balance ChangesEnergy from wheel clicks changed Clicking the wheel now restores 2.5% energy instead of a flat 2.5 energy.Positive status effects with Barrier fixed Positive status effects are now applied correctly even when the player has an active barrier.Some Steam achievements are now easier to complete Score-based achievements are now checked at the end of the level, instead of treating 5,000 score as the run limit.Rats now stand slightly farther away from the wheel This should make it easier to keep clicking the wheel when surrounded.⚙️ Settings & UI ImprovementsAdded HP/Energy display option You can now choose whether HP and Energy are shown as percentages or as exact v...

Posts come from Steam's official announcements feed.

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