The game had a good look and soundtrack, and it's great that you made a game in 3 days all alone! I really liked the walljump mechanic and the level design.
Some feedback:
- Rebind the restart key to R or Q: Space is usually jump in platformers and my reflexes kept restarting the game trying to jump ;)
- Try reworking the colliders: it was really hard to get on top of the stone player (if that was the right plan) as the game kept pushing me off
- Give better instructions: it took me a while to figure out that the green dude could walljump and the blue one couldn't. Also, the conveyor belts should be animated as I thought I was getting stuck in the wall
- A timer for the switch
Keep at it and improve this game further after the jam ends.