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.

I guess I was slightly put off by the whole game monetization and offers to play ads to skip this level, I mean it's fine to try and make money off a game, but a jam is really just for the fun of it, and people will play your entry to try and offer advice and sense of community so trying to monetize that good will feels a little off.

That said there are some promising signs... it looks good if dark, but it;s an aesthetic I quite dig, I am note sure if any of the sprite/ art work is yours or if you just did coding... but either way with so many external assets you have made something that feel cohesive. 

I'd suggest trying to up the speed a bit, as others have said it does feel sluggish... leave annoying  precise jumps till a little later or at least don't make them result in insta death. I am not one to talk as movement in my games is always pretty bad... but really focus on getting a character that feels fun to move/jump attack, and then you can focus on adding some metroidvania ability gating.

Sorry if the above was a little negative but hopefully constructive - but you are on the right track, and I would be interested to see future games you come up with

It doesn't seem like the game was made for this jam. There is nothing in it to reflect the theme "clockwork" and I couldn't spot any metroidvania elements.

For the game itself, I like the art style, but the movement is very lacking. The jumping specifically is very off. It starts off at high velocity then becomes floaty, making it impossible to judge precisely  (for me at least)

Spam entry game? Feels like an AI spam entry

Nothing is good. The movement is so sluggish, and who but attack in the pacebar. 

This didn’t feel like metroidvania at all. Maybe I didn’t get far enough, I got to what seemed like a boss fight because the music was so dramatically different but didn’t have the patience for it. Jumping felt really sluggish and I didn’t feel like there was any strategy to the combat. The atmosphere and primary attack looked good but the levels were so dark it was hard to appreciate the art.