Thanks Myna! You're right, I have to update the description (a new demo is coming, so I'll do that).
I also plan to make a new UI, and I'll definitely include mouse support.
Regarding the blocks feeling a bit stiff/rigid at higher speeds, I think it's somewhat unavoidable in this type of game. The "panic" after three minutes is part of the gameplay. I've added some "tolerance" to prevent you from losing in a split second (if you're at the top of the grid with no space, you'll have a little extra time to move the block).
Thanks again for this helpful feedback!