I agree it's a bit unpolished in some spots. I'm hoping to make a more fully fleshed-out version sometime that adds and refines a lot of things. As it is, I had to cram like crazy to fit the whole thing in 1 kilobyte. That's less than 1% the size of the original NES Metroid. Those are good points, though, I'll see if I can free up enough space to tweak them.