Cool concept, very creative and I especially loved the main menu tune. Had a lot of fun and I would absolutely play a longer, more polished version of the game.
Correct me if I'm wrong, but I believe you are basically softlocked if the boss takes out enough of your stats while you're on the bottom floor before you can climb and catch the two NPCs. My jump wasn't strong enough to get to them, and from what I could gather they're necessary to open the final exit.