From a technical perspective, the game doesn't meet basic minimum requirements that most PC gamers expect as standard.
A choice was made to use obsolete, decades old retro pixel "art" as a substitute for contemporary PC graphics. It's unclear if this is due to lack of budget or talent, regardless, the overall visual quality of the game is extremely low as a result.
There's no options to change the resolution for the game or customise the graphics settings. There's no way for gamers to ensure this is running at the native resolution of their displays... there's no guarantee this game will look right on any PC as a result of this hamfisted design decision. There's no way for gamers to try improve the low quality graphics.
The controls can't be customised, which will be an annoyance for many, but it can also render the game unplayable for differently-abled gamers.
Some of the defects in the game can be attributed to the choice of using the GameMaker Studio construction kit/toolset. This is a very poor quality toolset favoured by amateur developers as it's cheap and requires little in the way of development skill, but unfortunately has very limited capabilities. Just as you can't make a silk purse out of a sows ear, you can't make a great video game if you use a terrible engine. GameMaker Studio is most commonly used to make retro pixel shovelware and cash grabs.
A strong argument can be made that construction kits like GameMaker Studio should never be used to make games for profit, as the "developer", HugePixel has done here. These construction kits are intended to teach people some of the basic principles of game development, and to make small demos to pass around with friends. They're not intended to replace to actual work of real, professional game developers. So it's inappropriate when amateurs try to use these for profit, without any actual, real game development effort taking place. This doesn't result in products that have any real meaningful value for gamers.
These technical defects push this game below acceptable standards for any modern PC game.
The poor quality of this game is reflected by how many people spent time with it. At the time of this review, SteamDB shows the all-time peak player number was only 3 players. This is a remarkably low number, and now, the only player activity occurs once or twice a month, presumably someone loading it up to see what it is then quickly uninstalling it. Considering there's over 120 million gamers on Steam and well over 50,000 games for gamers to choose from (over 9,000 completely free titles), the overwhelming lack of interest in this low quality game is to be expected.
Warning: Review Manipulation!This game features a number of fake positive reviews from accounts known to be in the business of review manipulation/paid reviews. They're all written in either Russian or broken English, appear at almost exactly the same time, very shortly after the game launched on Steam, all have a direct Steam purchase of the game, and the accounts are used consistently to write fake reviews for asset flips and other cash grabs/scams. The "Positive" review score on this game should be disregarded due to this blatant, unethical review manipulation. This is done to deceive and scam gamers into paying for a bad product.
Gav-Gav Odyssey has the completely unrealistic cash grab price of around $7 USD, it's not worth it given the defects and shortcomings with the product, especially considering the unethical nature of the developer. Remember that if you buy a game from an unethical developer, you're putting your money at risk.
Profile Features Limited!Valve have marked this game as "Profile Features Limited" at the time of this review. This is usually caused by poor sales figures and low community acceptance for the game (to date). Until this status changes, this game will not give you +1 to your Game Collector badge count, appear in profile achievements or any other Steam meta-accomplishments, nor can it be displayed in some profile showcases. If these factors are important to you, it may be worth holding off before buying this game.