I’m scrambling to put together a stub written in C – a codebase I can compile to Linux, Win32 and OS X. It’s currently capable of building Linux and Win32 binaries from Linux, and I mostly know how to expand it to OS X (I’d build it natively, I wouldn’t know how to do it from Linux). You can check the progress here: https://github.com/sqaxomonophonen/cross-stub
I might chicken out and use LÖVE like I did in LD19. Or Unity. Or something else. I really like developing in C, but 48h gamedev in C might just be suicide