Yeah, arrow keys might be nice as alternate bindings when you have two people to play it so your hands aren't so close together. But I'd have to actually think about the code to allow multiple bindings for each control, so I'll get that later at some point. But I did change the left player to WASD, since that was trivial.
If things ever get less crazy and you get a chance to play against another person, do try it: some of the strategy ends up being interesting and kinda fun...like you tend to race to drop your piece, but it's often a disadvantage to get there first. And it's neat that you're actually interacting with the other player instead of just dumping junk on them like most two-player brick-stacking games.
Anyway. Thanks again for playing!