Hey there,
Will releasing two games at the same time lower the visibility of one or both of them?
I don’t think so. If they are your first games on this account, they might both go for admin review, so it might take a bit longer for things to appear in the search engine and such areas, but that’s about it.
Will In-game ads (promotions for my other games) cause issues?
I remember admins mentioning in the past that, putting ads in games is discouraged, but not against the rules. If you have to add ads, they should not provide a poor user experience.
Although from what I understand, you just mention one of your other games. I guess technically that’s an ad, but I’m pretty confident that shouldn’t cause any issues. I feel like it’s pretty normal to have a section in your game for who you are and what other projects you’ve made.
Cheers