This is a really fun and unique game. I especially like the opening and fusing animations. There are also quite a few music in it and they all reflect on the level well.
I think that there isn't enough time/opportunities to get familiar with the new tiles. I would be more comfortable when I get to use the same tiles a few more times before introducing a new one. The reset is also a little confusing since it's different the reset button in most puzzle games.
Still, I really like the game and its mechanics. Great job!