Definitely a good start. Some variety in basic enemies, the addition of puzzles on each floor, and a couple things like that would significantly improve the basic gameplay loop. But those are things that take time, and often get cut for a game jam due to limited time.
The default window size was too large for my 1920x1080 screen resolution, spilling off the top/bottom of the screen, and fullscreening it caused it to stretch funny, but fit on the screen.
Also the game froze on me partway through a second attempt and I have no idea why.