This was surprisingly solid for a first attempt at a platformer!
Camera and character lateral movement feels a little fast for the way the rest of the game is presented, leading it to feel a little floaty for my tastes. Coyote time feels a little too generous, and the game doesn't communicate the player's health (I seemed to be able to bump into goo friends a few times before dying, so I assume there's a health counter hiding in there somewhere).
All that said, this has a fun sense of momentum once it gets going, and there's an escalation in technicality of what the player is asked to do across the game's two levels.
Unfortunately, after looking more closely, it appears that the environment tilesets you are using are not compatible with the jam's rules. I am afraid that I must disqualify your submission until/unless you're able to replace those with something that meets the following requirements:
Your game can use assets that you created or assets that are freely/open culture licensed