Still I’m not sure putting it as a language is the best choice. How about adding it as a tag in the game, that way users can search by tag? They are meant as “custom keywords” for when users are searching for new games.
Apologies but I’m not familiar with “toki pona” or any community for custom languages.
I’m more familiar with Dungeons and dragons languages, like elvish, but I see what you mean. I just never thought someone would like to play a game in a language like that, which I find pretty interesting.
Now that you mention it that way, I see why that would be useful for some users. I hope tags can solve it, at least temporarily.
