Well, it was written in assembly anyways, so you can decompile it, but there are many macros I used, so it might be hard to read (for example scrolling is done without a loop, just 1000 separate instructions). There's so much spaghetti in there. I'll probably release that once I have some time to clean up a bit!
I wanted to emphasise trying to stay as close as possible to the original as possible, while still being a C64 game. I didn't have access to FB source, so it's just reverse engineered. It's still in need of tweaks and fixes tho (I spent 2 days on it).