Really good twist. I especially liked this because it ended up giving a similar sensation as most games in the genre but the way it worked was basically the opposite. Very fun overall!
I think I ran into a bug though. I played a few times and on each run my clicks would just stop registering at some random point before the time was up. (If I had to take a wild guess I'd say a variable to stop clicks registering while blocks were falling was getting stuck in its on state).