Sound would really add to the game. I don't think I'd add music though because I'd be setting a certain vibe, people might not like the music, copyright issues like you said and people could always play music from their computer. But sound effects would be so damn awesome. I haven't even looked at any of that yet though. When I get bored one day I might try doing a few tests to see if I can loop sounds properly and everything.
Yeah a few people have mentioned that. It's a super easy fix though, I'll try and remember to place him a little higher next time I update.
I haven't figured out a way to boost the character in the direction he's facing. But that's definitely on my to do list.