Oh boy, there are so many things wrong with this game. Starting by it's core concept: "A collectothon with only one collectable". This is almost the same as trying to do a roguelike without randomness, or a platformer without platforms... A collectothon with only one collectable just isn't a collectothon, makes no sense.
As a platformer, the controls are not good. The player doesn't jump high enough, and the camera makes you dizzy. I tried a lot, but I wasn't even able to get past the first platform. It was very frustrating, as after getting to the second platform, one mistake lead you to the bottom of the level.
Falling from the level doesn't kill you, but rather put you into an infinite fall.
Regardless, good job finishing the jam. Hope you had a lot of fun doing your game. Cheers.