Hi, thanks for the feedback! I unfortunately wasn't able replicate your experience with the cursor being overly sensitive, and am having a hard time figuring out what you meant.
If you're having difficulty playing the game, i was in the same boat my first couple of rounds. It picks up pace quite fast, and might be slightly disorienting for new players. Sorry to hear about your experience.
Also to note: you can swap blocks at any point in the game, even while blocks are already placed! Hopefully that helps you get that next high score!
Thanks for playing and im happy you enjoyed the music!