[Haskell-beginners] Spacewars! clone needs code review

Hello All, I've been spending all my nights lately on my final self-given Haskell "learning exercise" - a Spacewar! [http://en.wikipedia.org/wiki/Spacewar!] clone. It is playable but lacks the features that perfect a game - score system, menu etc' - and there's some hacks in areas where I didn't feel that implementing it prettily would teach me anything. The game is available under the BSD license in my github [ http://github.com/SonOfLilit/purewars]. I would be very happy if anyone would bother to review my code and suggest ways that I could improve it, since this is a learning exercise. Thanks, -- Aur