Historically I don't think I've ever owned a mouse on which the scroll-wheel didn't start misbehaving six months in, so I do think that ideally it should never be the only input responsible for something important in a game - A/D or left-right arrow keys, or right-click drag would have been good alternatives, for example.
That aside, while it is a bit on the simplistic side its a decently good game, especially since this seems to be your first go at a game jam?