Very nice game! You did a lot of levels and a win screen in only 3h. I have some small complaints but overall the experience is very good.
I think using the K button to restart was weird and i ended up restarting when i didn’t want to a couple times. Maybe using spacebar to stop the block and R to restart the level could be better.
The blocks falling with acceleration made it hard to control the timing to stop the block correctly.
I think the block count on the corner shouldn’t count the blocks that you didn’t stop.