I've fixed a couple of bugs that popped up after the change to the bigger map. This was one of those times when I looked at my code and... what was I thinking?! Anyway, there was a large chance that when you let go of the Koopa shell, it would go backward and hit you in the face. Also, when you bounced a mushroom, it would almost always go the wrong way.
Also, I added a lives counter, which is completely independent of the coin counter. However, it's a bit useless at this point, as lives aren't actually implemented.
* calc84maniac decides to update the first post, for once...