Well done on making the first game!
I takes a log of courage to share you first steps with everyone. Here is some feedback on how you can improve (without repeating any of the previous comments that also are very relevant):
- since it is impossible to jump between platforms without sprinting, I would recommend making sprint the default moving option
- restrict the sprites from moving in 3D (unless this is your actual vision to make them drift behind and in front of the game world)
- if you can play the game it is finished enough :)
Keep it up, hope to see more games from you!