I'm impressed! There's a good amount of content and mechanics to the game. The 2d lighting looks really good and I'm glad you're allowed to move freely after you clear the floor. I played as the monsters and got to floor 10 but the game seemed to freeze with a black screen after I finished purchasing an attack upgrade and health power up from the merchant.
The rooms felt a bit big though since there weren't that many monsters / player characters to fill them up. Maybe the game could have either had more units or some terrain tiles that gave you advantages. Alternatively, shrinking the room sizes down a bit would make the game feel like it's using the space more effectively without taking away options from the player.