One of my favorite things about game jams is getting to play unique little games such as this one! It was incredibly hard to get used to the controls, but satisfying when finally getting the squirrel higher!
I'd personally like to see you make the controls a little bit more forgiving, maybe have the space release button move at a lower speed, or mouse button hold it's position for half a second every time you click it. Maybe even go as far as to do both?
The art and audio are all great, and the idea is completely unique and interesting, at least I have never seen anything like it. Well done!