Simplistic gameplay, but the background theme is pretty neat, the UI implementation is nearly perfect (just put the control type after the control name please) and quite advanced for a game jam (bonus, works with my Screen Reader of choice which is awesome!) and I love the difficulty options.
The audio could be a bit more interesting, but the retro thing isn't all bad either, and the difficulty slider could probably go higher. The addition of music (especially if it changes with what stage you're on) could add some atmosphere, but the cool effect on the computer voice, while basic, is pretty neat I think.
Over all a perfectly serviceable entry, with a technically impressive UI that you should be proud of!