Perhaps consider opening it up in a limited fashion to start? See if you can find some vetted contributors first, and then work towards eventually open sourcin

Perhaps consider opening it up in a limited fashion to start? See if you can find some vetted contributors first, and then work towards eventually open sourcing the whole thing once you feel it's in a better place and it's been (sort of) peer-reviewed for bugs etc.. There are plenty of people looking to get into the games industry, and working on a shipped/existing project can be much less daunting than building your own thing. It might take a bit of time but I'm sure you could find some collaborators, maybe through game jams or meetups? Also, everyone writes messy code. I wouldn't stress too much about that part. p.s. Congrats on shipping it! :-)