However we would need to have access to the necessary components to replicate that custom engine in order to fully test the game
I make my games using a programming language I’ve designed, combined with a compiler and a custom game engine I developed. Currently it’s possible to compile automated builds for Linux, Windows and Android using Github Actions, so someone with programming experience should be able to compile and modify such games from source.
The game devs are welcome to do the additional work if they’d prefer or we do it ourselves.
I understand my case is a bit niche and it might be difficult for a 3rd person to make changes on my projects, given it’s a unique programming language.
Having said that, this seems like an interesting challenge. If such projects are allowed, do let me know. If not, no worries, it’s perfectly understandable :)