Spyro the Dragon - the first game specifically, I find it more of an immersive treasure-hunting experience than the next two games, which are more obviously… I dunno, video game-y. I like all three but I always 100% the first game at least once a year.
The Tomba games are great! I was thinking of replaying them this year, actually, probably for my Halloween gaming season (it’s not horror, I know, but there’s a lot in the games that was just creepy to me as a kid)