The FATE series. No, not the anime, the Diablo ripoff computer game with stolen music sold by WildTangent. I was a kid that got by playing only demos, and this game was one I reinstalled over and over again to get those free plays.
It's a pretty simple dungeon crawling game with procedurally generated floors where you have to get to floor 5x and defeat the named boss there so you can reincarnate and start it over again.
I reinstall it every couple of years to play it. It's got hardly any story, quests are generated for the floors you're about to reach, stats are randomly generated. It's just pure gameplay, though a bit repetitive as it can be. I love that it has a similar fish mechanic to Torchlight for your pets.
I remember seeing a nostalgia post on the game on Reddit and the developer of the game series had commented on the post. It was like meeting one of your heroes. Definitely very memorable for me.
The third game supposedly has all the content from the first two, so here's the steam link if anyone's curious.