Thanks for your feedback ! :D
I am looking for a solution about lag. I think in the next update it will be better.
If the control feel slow I think it's because of two things. First maybe the animation is a bit too slow (because it's the first time I've done animation in my game, it's not perfect). And I think also there is a lack of feedback when you press a button.
For background parallaxes and smooth corner It can be a good improvement to do.
Maybe in the next update I will improve all of this