I have to agree with Atomic Burning in the comments below. It's simple and too easy at first. But it then gets harder and harder. The art style is charming and you limit yourself with making circles, squares, and X marks(?). It's also a great representation to say that the squares are bad.
In my opinion, I feel like the loading screen is unnecessary. I'm not sure what the loading screen do, but it just loads every time the player wants to play the game. If you want to put some comments, you can do like what Mojang did; put in the title screen.
Overall, I think it's a good game. This game feels more incline to making a hyper casual mobile game.