It has a bit of resemblance, in that it’s a dark fantasy action game in which the player character fights a very large number of enemy units in order to level up and increase their power while fighting bosses interspersed throughout, occasionally upgrading abilities and acquiring gear. and of course the art style is directly cribbing Diablo 1.
But in the nitty gritty of how the combat works, how the gear and abilities work, the format of the levels and win condition of the game and pretty much everything else, it’s very different from Diablo.
I find the biggest difference in itch scratched between Diablo-like ARPGs and Halls of Torment is that the pacing is very different. Diablo has a lot more player control over when there are breaks in the action providing downtime for the player to sort through gear and abilities. Halls of Torment sort of has that when you’re making choices, but it’s waaaay faster