That sounds great to me
In that case, I think the best credit would be something like:
Special Thanks
TerminalInternet
Or, if you end up publishing several videos or creating regular content about the game, something like:
Content Creator Support
TerminalInternet
Of course, if later you also want to help by testing new versions and reporting bugs in detail, we can talk about adding a more specific tester credit too.
Thanks again for your interest and support!