I really like the ladder mechanic

Nice idea. Instead of the jump button, you interact with other elements.

The spike explosion SFX destroyed my ears. I think that happens because each spike that exploded plays the sound.

The artstyle was consistent (except for the player that stayed in pixel art). However, I didn't feel the retro vibes to be honest.

Good level design (even if you want to make it a little bit easier for game jams).

Game has arrow controls not WASD so i cant play as my arrow keys dont work,...sorry [can u play my game too]

Very nice, I could beat the finally level :)

Cool game, especially some of the animations! (like the fire one)

Great job, the distorted background effect turned out really well, it reminds me of various old games that used that style.

I know you mentioned this, but be careful with the audio in GameMaker, you always have to turn it down quite a bit, lol. Good work! :D

very nice, i couldnt beat the final level tho

Very cool game, reminds me of those older games I used to play in maths class. The readability of some elements, like text, is a bit hard due to your outline shader and having anti-aliasing on your text anyway. Overall, a nice experience 

UPDATE: added some effects and other stuff :D