Idea is decent enough, and graphics were good too, but the gameplay could be improved on in my opinion.
My biggest issue was that the player character doesn't change color himself, meaning you have to look at the top left(or see where you don't fall through) to know what color you're in. The jumping physics were good at first, but when i had to make a U-turn to get into the higher platforms it fell apart.
The ghost of the same color as the player-ui should look like items/spheres instead of ghost. That was quite confusing. And lastly, that the player loses health over time was really frustrating, especially since the health pickups were always in places that were difficult to reach.
I said a lot of criticism, but it wasn't THAT bad, i did enjoy a bit of it. It was more like because i feel like there could be done more with this game is why i criticize so much ;)