I heard about the steam release! That's great! Can't wait!
Shattered pixel dungeon is a REALLY well made EXPANSIVE roguelike (No. Not roguelite. Sue me) I'm pretty sure its only on mobile but maybe wrong about that. I played it a while ago and there are SO many things in that game. So much content that you wouldn't even imagine when first opening it! The art is great! And the game play is hard but once you get the archer unlocked it gets a little easier and you do get the hang of it. The progression is also a bit out of balance (very difficult) but once you learn the way the biomes work and the enemys they house it get easier. HIGHLY recommended. And that's saying a lot since I'm not a mobile gamer at all.
I can't remember if I ever beat it... I do know I beat the dwarf king (I don't THINK that's a spoiler... I hope not) But I don't know if he is the last boss or not.
I was wrong! Its not just mobile! Its literally on itch! https://shattered-pixel.itch.io/shattered-pixel-dungeon