as some other people have mentioned in their reviews, the game becomes extremely difficult around level 6 (I’ve personally been stuck on the second Very Hard level of level 6 for at least a week now). One thing that I think would help with this issue is having more opportunities to earn coins in-game, like in the staying alive mode, or you could even add a multiplayer mode for anyone who has the app (like pairing up w/ random other players or something).
Also, I’ve noticed a glitch: sometimes when you pick up multiple powerups it causes the character to kinda “jump”, occasionally making them collide with the airborne bubbles.
Apart from these two things, this game is really good, and it definitely lives up to the original desktop game.