A fun game that I can easily see myself sinking "more time than I have" into. The artwork is excellent, the soundtrack is delightful and catchy, the audio effects are a good fit for the game.
The concept of purchasing blocks that I was already seeing in the game seemed a little unusual to me, I didn't quite understand the reason for needing to buy them, but the upgrades or extra blocks I hadn't seen were a great fit for the shop.
Some extra features that may be good additions would include some way to 'lock in' blocks to stabilize the bottom of the tower, or blocks that glue themselves onto the stack to hold in place. Some of the builds got to the point where I couldn't really add any more to the top because there was no flat surface to put things on and they just slide off - so a block that would freeze in place could be pretty useful here.
Overall, a great game - well made, fun to play. Nice job!