Actually perfectly fine as a short game. Nice that there were very few gotcha setups by the devs. Only rough part is restarting an entire level when you die, which really sucks on the autoscrollers. The main objective is to collect magnetic keys to unlock the door at the end of the level. So you have to explore each level thoroughly. I found one level hilarious because normally you have to find 5-20 keys. But this one had 54. It was just the devs messing with you because they had just grouped a ton of keys together.