The graphics are very nice, but you should try to think about how much time players spend waiting and replaying boring parts.
When you fall you have to wait for your lifes to go away, then there's a pause, slow fading, and go back to the start. Jumping takes long so you have to wait to reach the ground. Slow walking with lot's of places without any obstacles make you have to wait to reach something interesting. The slide starts fast but slows down to a moment where almost nothing is happening and you can't control anything.
I didn't play past the tutorial so I can't give a fair rating, but all the waiting is just too boring to even bother.
I hope you work on it more because these are easy problems to fix and the game could probably become quite interesting if you do!