I always liked "hack'n'slash" mini-RPGs, where you could pop in for a few minutes, play a level or two, and then forget about it.
I always disliked the RPG games where you could gain significant rewards just by semi-randomly clicking on nearby enemies, with occassional pause to auto-heal.
That's why I created RetroVirus255 game. If you just start playing blindly and clicking in enemies, you will be dead in a few seconds.
It's a cross betwen RPG and puzzle game, because the combat is deterministic - it has no random elements at all.
Unfortunately, it has some some social elements and you have to be on Facebook to play it. Go here to try it out.