Let there be sound!

I added sound to IPSA. They’re just a few basic sound effects made with SFXR, but it adds to the experience.

I think I’m going to do a basic background track for it sometime today. Then maybe change the end of the game from a pop-up to a screen of some sort (well, two, one for winning, one for losing), and then it should be done.

I also fixed one of the most embarrassing side-effects of copy-pasting similar code. Not paying attention to variable names. >.>

Download.