Thanks for the feedback!
I agree with your idea for two-user keyboard inputs, but unfortunately, it was one of those things where we didn't think about it until we were packaging the game at 2 minutes before the deadline... (what is time management?)
The filesize is also a bit terrifying to me, I think it has to do with the unreal engine's default packed content, so it could probably be reduced significantly! All of the assets we actually used were original and probably only add up to 30MB or so uncompressed. I'd like to fix that once edits are enabled again.