Sorry for the orthographe, i'm not english.
i play to your game until the end, 0 death, and i have a few tips.
-Make the monsters harder, i literally one shot every bosses.
-maybe stop placing the orbs (or XP, dunno) after the level three, they became useless, or replace it by something else.
-make maybe some "potion" that we can drop, and the effect would not be see
- a little text after the bosses would be cool then juste YOU WIN, :3
-maybe more animations for the bosses, that just look like moving statues
-maybe saving spots could be useful
- achievements, medals! it would be cool!
Anyway, i enjoyed your game, Four stars for ya buddy