I admire your persistance there guys. For me one of the hardest things in regards to programming is keeping motivation beyond a "proof of concept" type stage.
Just a thought, but any chance of a system friendly version? This way you could play it in a window as a "Workbench" game. Not to mention OS4/MOS/Amithlon/etc owners could join in the fun
It also potentially allows for some more eye candy (rtg screenmodes+color depths).
Could be interesting learning to use more Amiga mode stuff with blitz too if that tickles your fancy
Anyway, just a thought, feel free to shoot it down