It's done!

That is, everything but the sound is.
I may not finish the sound by Sunday (should do, but I can't be 100%), in which case I'll release this version on Sunday instead.
Also, things may go terribly wrong with the sound on various systems, so I'm going to have to abstract it away and try and check for errors at runtime then run with a "null" sound driver if things go wrong.

Doing the additional checks is probably what will take up most of the time.
I'll be using sfxr to make the effects, which is exceedingly good at making retro noises, which fits in with the whole theme Hoshi goes for.
I'm going to try and recreate the original sound effects as closely as possible, but that may not work 100%, will have to see.