Hades II is just Hades again, which is a good thing.

Hades II takes a lot of mechanics from Hades and transforms them in a way that makes it feel similar to Hades but it plays quite different. First of all the bosses, they are super good and they took everything they knew from the Hades to make even better bosses. The resource system has been improved and drastically changed.

Hades II is clearly it's own game using some parts of Hades here and there. Like how they have some of the same Boons but a lot more new ones added on top. Hades II is the definition of what a sequel should be and it's not even finished, it's an early access game that will receive many updates. If you enjoy Hades / like Roguelikes in general you should 100% get the game.