Nice art, music and sound effects. Really get that retro vibe from it.
Good, amusing dialogue and story. Very weird and wonderful.
The combat UI seemed a little complex. To attack, I have to press space 4 times. I couldn't move and then attack, unlike the enemies, some of which can move long distances. I have to select attack, then exert, and then move from there to move and attack. When I run out of energy, I can't do that any more.
The combat AI was good.
When I equipped a weapon, the character's attack points stay at 0.
Maybe indicate on the doors when you've completed their room challenges.
Overall, a very enjoyable game, if a little bit slow and grindy for a dungeon crawler.