Very fun as is! If you're interested in feedback, see the below:
- It would be more engaging as a timed exercise where you try to get the most points in X seconds, and then your points are added to the shop but reset to 0. A leaderboard would work very well for this game. If it was timed, you can also introduce incremental difficulty -- the time limit is very overwhelming for new players and it'd be great for the player to work up to it and see some successes before they master the game.
- There should be a more drastic visual change in a block when it is no longer able to be clicked, the fade out effect creates situations where the player feels like the block is still there when it is no longer clickable.