I played your game some days ago already.
Regarding the game itself: it is not a dynamic game imo cause there is no constant move. It is very simple yet oryginal and nice game. One thing I would definitely change is the jump control. It would be much more comfortable to tap left and right side of the screen at once in order to jump then to do the slide move.
Regarding the performance. Even that it is such a simple game you can clearly notice the little fps drops in moments like jumping or bullet (arrow) explosion. Also sounds effects have some delay. You can clearly see that while tapping on the level selection screen. However this can be fixed by moving sound files to the music directory in C2.
So to wrap up. Nice game, good job . I played several levels and had some fun. Furter levels were annoying for me cause of hard jump control - but that might be just my feeling. But the performance of such simple game should be perfect on device like SGS4, and it's unfortunately not.
I really hope that they will release some boosted Crosswalk soon. When this happen C2 will be a tool that all mobile developers always dreamed of. For now I find C2 as an amazing tool for HTML5 apps which runs on computers and a bit less attractive when you need to build a mobile app.