It's a nice game. The graphics are nice, music is amazing and controls are ok.
But it is very difficult because of that tubes, which hurls swarms of black balls of death almost non-stop. I stopped playing at the level which makes you run through the lake before the water raises up and than you have to jump up through swarms of black balls.
Also, the balls can go through pipes so there is practically no cover from them. When you first encounter them, they can even reach at the place where you spawn at the level.
Other than that, I would like some indicator of how many coins I have collected and how many of them are in the game and maybe death counter. Of course you may already show deaths at the end of the game, I don't know.
And the bunny's jump height seems to differ randomly. But that's just an interesting detail, nothing to complain about.