I got into the beta, if anyone needs questions answered, ask away :)
To me, this is a great sandbox, mario, relaxing game. Its simple concepts explored in amazing ways. The level possibilities are endless. I have played boss battle levels, Mario remakes, space ship levels, sweet child of mine level (each note has its own sound box) and sadly even a rick roll.
The control is amazing. You have little stuff that you can put on your player in the beta, but I put stickers on it to make it all black and like a ninja. You can control which way your head faces, you can even control your arms fully, and can slap people. Another great feature that I love: you can take Pictures and use them just like stickers (which can be put anywhere). Last, a great feature is that you can do emotions. There is sad, happy, angry, and crying. you can tap them once to make your character sort of express that emotion, or if you tap it like 2 or 3 times, the sackperson will deeply show their feelings.
There are plenty of levels to play, and if you don't like creating things, you can just play other levels.