Fuck, that sucks. And I can't even blame the lemm.ee admins - burnout is a pain.
TL;DR: IMO lemmy.zip > sopuli.xyz, sh.itjust.works > lemmy.world > beehaw.org
At first I'd probably try lemmy.zip, as it's "A Lemmy community for everyone, with a focus towards tech, PCs, and gaming." (in its own words). It seems fitting.
sopuli.xyz and sh.itjust.works seem to be sensible too, and each has a few game-related comms already. I don't see many issues with either, even as I watch !yepowertrippinbastards@lemmy.dbzer0.com for free popcorn.
There's also lemmy.world, but that instance is already the largest one, and it would be unwise to put even more eggs in that basket. There are also political issues but... meh, I don't think they're relevant here, so it's still an option.
beehaw.org as a last case scenario. The game is wholesome so it would fit the instance; but you'd need to ask the admins to allow you to create the comm there, and beehaw defederates from a lot of other instances (higher behaviour standards).
Note that I did not check if any of those are for 16yo+ users.