bigmachine,
this is something that i have been wanting to do for ages in c2. defender is one of my all time fav games, and i wanted to do a clone but i was not sure how to handle the 'wrapping' mechanism.
not many 2d games work like defender did, where it had it's own inclusive 'world' on the screen, and you could navigate through it, with the help of the radar.
will you share how you pulled off the 'wrap'? i would love to hear how you managed that. plus, i think it would help enable a whole sub-genre of games to be made, using that 'wrap-world' mechanic.
love your retro graphics by the way...