A fun little game, though a little frustrating. Putting upgrades behind overall floor level unlocks when you can't see what overall floor level you're on is very unintuitive. Upgrade tree unlocks should either be regulated by experience points available (which currently you gain exp much faster than skill upgrades are available; this needs more balance), or by which overall layer you're on. I think optimizing and streamlining the skill tree would boost the play experience quite a bit.
Also, light levels are kind of annoying to work with, as you can't really see what you're doing for a long time, and you're just clicking in a small section of the map fairly blindly. Light items don't seem to help much, especially the hanging light, which doesn't seem to do anything?
The rest of the map doesn't get used much, there doesn't really feel like much reason for it to exist at the moment, beyond occasional events. Not sure what the best fix would be for the game experience, whether to add more interest to it, or to make the overall map size smaller.
