Unfortunately, I didn't have a couch co-op friend with me. I can see how this game can be quite a puzzler with the limited movement. Even without a buddy, I think the only thing missing is an indicator for how many steps a player has in the round. I think it also might be interesting if the players didn't freeze when the lightning was striking, which would probably make the game feel a little faster.
That said, without having a coop buddy, I can't say these changes would actually improve the experience besides my limited playtesting :)