Seems like a WIP. My suggestions to make the gameplay fun would be to change the assets and add some more UI elements. Maybe make this sort of a challenge with timers, high scores and leaderboard. 

No audio. Don't know if that's intentional or by mistake.

Right now Charles follows you at a constant pace, and seems  unperturbed by the obstacles. I'd suggest having Charles start slow and slowly speed up to give the player time to learn the game before getting hit with difficulty, or getting blocked/slowed by the islands he goes through. It'd also be a good idea to explain how to increase your score (getting the golden trees).

Fullscreen would be appreciated, since the game is quite small rn