Icey. A hack-and-slash action game with meta commentary on game development. The keyboard controls are rebindable, the mouse is not supported, the progress is saved at check points. It did not seem possible to change the difficulty level after starting the game, while the "true" ending seemed to require to collect all achievements in order to unlock, which in turn required to replay the game with its rather inconvenient restart system (could not interrupt a run, but could start from an unlocked location). The narrator was slightly annoying (intentionally) and sometimes spoke too slowly (unintentionally; also the lines are not skippable).
There are several bosses. The combat system in general should be good - there are combos, dodges, "parries", it is possible to change the direction between attacks, etc., but the enemy movesets (attacks and speed) felt somehow unpleasant. It was entirely possible to get stunlocked/juggled by lasers and be defeated rather quickly, despite the i-frames and armour, while being unable to see which foe was attacking. On a positive note, there is no contact damage. The new attacks and other upgrades can be unlocked for XP earned by defeating enemies or finding chests (unless the optional path chosen leads to an ending).
I guess, collecting the remaining achievements should take about 1-2 hours, while the game up to this point has taken 3, but I'd rather let it be. That is to say, it was fine, not deep or outstanding, but playable.