This is a really great game. I love the simple and easy to understand core game mechanic. The block remind me of tetris. However there are some areas where it can be improved.
1. An option to cancel my block selection would be nice.
2. A few more extra sound effects for choosing a block, rotating etc would really make the game feel a lot more lively.
3. A simple indicator on where the block would fall could also be nice.
Other than that, the visuals, the effects and everything else is great. Keep up the good work!