Hello, I would like to say it is a fine game, cool music, good graphics, and everything works well.
I think there could be more "momentum", a bit more of acceleration of the parallax after some time rolling, and decrease it again after the player lose one life.
I did perfect back and forward flips in the air, but I (as a player) would be expecting to keep doing a couple more successfully before hitting the ground.
As I said earlier, the game is great, but there is room to make it even greater.
Cheers.