I am not sure why 'idle' is in the title, this isn't an idle game whatsoever! You need to be clicking to progress, otherwise the progress is going to be EXTREMELY slow if not impossible. The game is very short, but insanely satisfying. The style and the music is pretty unique and there's a little nonsensical story to go with it.
Progress is constantly and steady, you never really stall and there are no true prestige system where you reset and need forever to get back to your previous state, it takes the matter of a minute to go back to your same upgrades! The game is nothing revolutionary, sure, but it kept me engaged from start to finish!
Overall, a fun little incremental clicker game. Worth it on sale! (Because it's 2 hours long.)