Why you put monetization on a jam game ? and why I can watch ads to skip a "level" in Metroidvania game ? Am I misunderstand what is metroidvania ?
Well, ignore this and let me jump off to the game.
It dose catch me before actual playing because I like game has a dark vibe.
and your game asset look great ( you list out a lot of art asset so IDK which is your work )
1) character hitbox is... weird, are you using capsule for character vs map collision ?
It can simple slip off from the edge after center of character have little bit step off the edge, this is little annoying, at least in a 2D platformer need often jump off from edge. ( in my opinion )
2) I can save and load anywhere, and the level have some location need you travel back a long distance before try it again, so what I do is just save and load if I fail to jump.
this make me feel boring, but without this, the whole level design is just give me stress, because I need to restart the level after instant dead or need a long time to travel back.
I recommend simple remove save and add check point in mid stage, but again, I don't feel this is metroidvania.
beside of this two point, the combat also very vague, maybe it's because I only have one attack ability, boss fight only need to pressing space again and again ( no movement ). If there have any ability make combat funny, than I think you can give player one more ability at start.
I only point out some cons, so don't get me wrong, hope to see a improved ( and related ) game in future.