Good effort for first game jam submission! Fun stick figure character. A few things you might consider if you keep developing the game post jam:
The difficulty ramps really quickly and the player needs to learn all of the moves almost from the start. I think you could have simpler levels at the beginning which would also serve as a tutorial. Introduce one new mechanic for each of the first few levels. Initially just jump, then double jump, then ground pound, dive, etc., with a level tailored to introduce that new move. Then you could just continue to ramp up the difficulty with each successive level.
This might just be me, but I would find it a bit easier to control if I could do the jump/pound/dive with my other hand. Space, Enter, or J... something like that. That would help me hold my direction a bit steadier as I'm switching between double jump and dive.