TL;DR: If you like beautiful graphics and music, easy gameplay that can be sometimes difficult, and great relaxing gameplay, this is for you. (There is also characters and upgrades, so getting bored won't happen too soon.)
This game is wonderful. All the negative reviews are strange. The ads have never been excessive for me, I only get ads when I watch them to get an extra life.
The controls are simple. You drag your finger on the screen, and the character moves according to your drag. (See the game trailer to see how your character works.)
The graphics are VERY pleasing, and I haven't had a single issue with them yet. Everything about this game is beautiful, even the small and almost unnoticeable storyline for the little girl.
The gameplay is perfect, and fits my style of gaming perfectly. I'm sick and tired of all these games that are being made nowadays, they are boring with the same old graphics and gameplay. This is quite fresh for me.
The only complaint I have is for a certain level/chapter, "Shadow". It's incredibly difficult, and it seems the only way to best it is to complete a perfect run through the level. Which is fine, since, it is the last level and all. (Aside from Endless.)
Anyways, the only reason I give it 5 stars, is because it's worthy in my opinion. Thanks.