even then you'd need a lib to 1:1 recreate every renoise dsp faithfully. I doubt the details/code be opened by the renoise crew, or product made because there is no real market.
in earlier days of game programming good music for games could be gained by tracker like sample playback libs - simple sound, but more effective than plastic fm opl3 midi, also lower file sizes, and mp3 wasn't there already...like a real banging module with 8bit samples 250k vs some cheap midi shit that sounds different anywhere or bad mp3 that sounds like underwater...so choice was made for some games.
maybe if you want to be real retro, you can search old mod playback libs, but they will sound like...oldschool trackers and have no advanced dsp for you.
heck, if you just want your music to play in game use mp3 or similar codec. one reason to do what you want to do vs just using mp3 renders would mean a dynamic music system to adapt sounds to the game action. this be interesting, but I fear there is no renoise lib to do it for you. renoise still might be interesting for composition of the used elements, so if you like renoise to compose stuff, you can easily extract note and automation data from renoise songs, because files are saved in easily readable format.