An interesting idea, but a bit frustrating.
The fact that the blocks don’t line up with the different orbits is quite frustrating you’re never quite sure whether you’ve placed a block correctly. Another solution could be to let the player move them before the countdown starts, giving them more time to position everything properly.
I’m not sure whether this is a bug or if I’ve misunderstood one of the mechanics, but in level 5, after the cube destroys two red blocks, it just stops