This was really fun! I am especially impressed with how much content you managed to add -- which also relates to my main criticism because I think the game is too long (and too difficult for me at least). I spent way longer than I did on most game jam entries (which is a good thing obviously because I enjoyed the game enough to stick around), but I never even managed to beat the first boss. That's a shame because most people probably won't even get that far in the time they're willing to invest and miss most of the content you created. I think for game jams it's good if the players can see most of the content in 5-15 minutes as a rule of thumb.
Also I really enjoyed that you made the game structured like a roguelike, it works well for the theme imo. The one thing that was missing for me however was some more variety so each run would feel different and not too repetitive. Of course making a whole insanely complex roguelike/lite system would be way too much to expect for a 10 day jam, maybe multiple possible level layouts that get picked randomly would be a good start.
I hope this comment doesn't read as overly negative, I genuinely really enjoyed this and see a lot of potential so I wanted to offer some (hopefully) helpful input. Looking forward to seeing what you'll create next :)