No, I've used sounds before. I don't use them often, partly because I don't want to spend a lot of time looking for them and mostly because I don't really have an excuse to put them in. Most of my games aren't explodey color funfests like this one, and I can usually get by with just a jump sound. I let my MIDIs take care of my soundwork.

The Oregon Trail used a lot of sound in a similar way, and as a whole is a lot like this game, though it's a little more clear what the heck is going on. I probably should use sound more- it's something I haven't really utilized much.