This is a really good roguelike. There's interesting build variety between the classes, and the optimal build per class varies depending on how your run's going.
Tactically it's full of tricks and optimizations. You'll need to adjust your tactics as you meet interesting new mobs. there are frustrating tricksters, slow brutes, fast little menaces, and a lot of cool and weird things I won't spoil here.
i WILL be keeping this and coming back to it now and then. Good replay value and it's a fun way to kill an hour or two when you're bored