Yeah, point and click does feel very fitting for OTGW! I think it's because, by their nature, point and click games are rooted in exploration, examining everything from the characters to the setting. And there are still some things you can miss, just because they're not integral to completing the game, but the developer decided to include them for fun.
In the show, even though we explore some of the Unknown through Greg and Wirt's journey, you still get the sense that there are still many more secrets we have yet to see.