Ok, this is beyond amazing.
The level design is epic, level 8 - 10 is very smart too. Although it goes off-screen, the destination is shown first, I think it is very fine.
The music also fits the graphic a lot. I am liking it from the start. Oh, and you make the music by your own? That's so cool!
Level 5 feels a little weird to me as I feel like to stand on a pillar, it should be "combined", but your way of separating two cubes certainly make the control more challenging.
Overall, very solid gameplay. It is a great entry. I like it very much. Do check out ours if you have some free time.