Was loving the music and atmosphere at the start.. then I got a little frustrated and took it out on the music! Still nice though. :)
I actually really like the simplistic tiles, it's super clear what they are. I played a few times but never managed to fill the grid (I'll come back and try again later). Only thing I would change is the tool tips which continually appear over the grid tiles, once you know where you want to place the tile I found this a little distracting.
Perhaps I didn't have a good strategy. Could you build the game up slower (with less choice of tiles at the beginning) so the player feels they are making progress?
Really good overall, well done!