First of all, I think that this is a great concept but there are a few performance issues. Like how sometimes some of the pieces will get stuck and not fall down. This is a minor issue but still can be annoying. Second of all, there is not enough content. I think that if you are going to release a game make it have more than 4 levels. And also, if you press the gear icon in the top left, (I assumed it was the settings) it skips the level.
So overall I think that this is a great concept but there is a lack of content and a few performance issues.