Fun game but there are some things holding it back from being as good as it can be:
1. There is no clear indication of when you gain a new color. I think it would be easier to understand if the top of the screen only showed the colors you currently have access to.
2. When the gates pop up from the ground, they oftentimes do so when you're way too close to properly react. There was one time where a gate popped up and knocked me backward exactly as I was about to cross that spot on the ground.
If those things were changed then I think the game would be significantly improved.