I really like all the neon colors, they are very bright and vibrant, but playing through this I noticed a few issues.
First is the fact that you could infinite jump by just pressing space over and over. Being able to fly around the map removes all the platforming aspects of the game.
Second, sound effects would have been great when jumping and picking up the gems. There were times I wasn't sure if I picked a gem up.
Finally, I don't believe you implemented either the theme or the special object into the game.
It's a shame that you submitted the game with four days of time remaining that could have been used to polish these issues.