I believe you have to submit your own website to this one for manual addition to its index

Yep this should do the trick! I see it’s been 2 weeks so: how did they turn out?

Probably my favorite game of the last 10 years or so. Enjoy!

Wij zijn al lang gefedereerd naar je instances en koloniseren je communities as we speak

If i understand you correctly: you are not limited to the small instance dropdown list in Jerboa, you can just type your own instance name in there to log in to it. That’s what I did at least. If you mean more instances in general should be available in Lemmy: agree :)