I’m about 100% sure that all of the games for Adventure Game 2021 have been picked (in fact, I think that was mentioned in an episode), but I have a suggestion: Lost in Time by Coktel Vision. It’s a…very strange first-person adventure game with some FMV and, in the case of the CD release, partial voice acting. It’s a game that stands out for me, because of these features. The solutions to some puzzles are very moon-logicy, but there are some pretty good walkthroughs, and there’s also an in-game help system…sometimes. When it feels like it.