Solid foundation for a dungeon crawler here! I liked how the constant spinning and not having complete control of your aim puts emphasis on your positioning instead. The upgrades felt nice and powerful (especially love the twirl that fires bullets around in a circle).
If I may give some criticism, the difficulty ramp is pretty slow in the beginning, with the first few floors feeling the same with no increase in challenge. It isn't until the roomba enemies are brought in that things start getting a bit more difficult, and by then you may lose some players before things get really interesting.
Overall enjoyed playing it, very well put together!