Hey, I like your game nd it has a lot of potential, but the main issue i have with this is the camera it follows the player slowly and because of that the main cause of death i found was because i couldn't see where i was going and this becomes frustrating since it sends you to the beggining of the game.
normally, in a sidescroller the camera wil be in front of the character and show more of the screen of where you are going and hide where you've been since i.
Other than that, level design wise, you made interesting and fun choices with the bouncers and some gaps, I'd recommend you raise some ceilings (For example in the area where the first spike dropped) so that the player doesn't bonk it's head against the wall.
It's a good proof of concept for a jam so good job.