Remember that old flash game where you guide a missle down a tunnel and try to avoid crashing by flying through holes in the walls? This game is basically that. And that's fine! I like that kind of game. But the controls here kill it.
You fly through the holes in letters and avoid touching the letters themselves. While you're free to move whereever you want horizontally, there are only two vertical planes: top and bottom. So you can't fly through the center of the letter O; you have to fly around the upper or lower corners of it. So that takes getting used to.
But the WORST thing, by far, is the camera. The whole game is about lining up your block to make it through the empty spaces. But every time you move, no matter how small of a move it is, the camera violently whips around so you can't see straight. Imagine trying to thread a needle while shaking your head back and forth. It's nigh unplayable when you can't figure out where your block is going in a game about percision.
You know what would fix this ENTIRE game? Lock the camera behind the cube you control. That way you can actually see what's going on. The way this game is now, it's an unplayable mess.