I don't have a ton of info for this one but the premise sounds very interesting. Rogue Legacy is a 2d platforming roguelike. While superficially it looks a bit like Terraria it's not a sandbox world building game.
TrailerDev blog pageYou can preorder here.Instead, you pick from one of a few classes, and adventure through randomly generated castles, acquiring lewt and new magics, finding secrets and killing bosses. Outside of dungeons/castles, you can construct your own fortress, adding new wings and additions which (I assume) gives you some sort of passive bonuses. You can acquire blueprints in the dungeons to build new, special additions to your fortress, too.
The real hook of the game though, is dying. See, there's permadeath but you don't simply roll up a brand new character. You have descendents! Each descendent is unique, having different coloration and possibly a "trait." These traits seem to be of the "in-breeding" variety, so your descendents might be color blind (making the game black & white) dyslexic (making signs or conversations harder to read), far-sighted (things at the screen edge get blurry), have issues with flatulence, gigantism, dwarfism and more. Your descendents can go find your previous fortress, now partially ruined, and continue the process of rebuilding it.
I love games with meta-mechanics like this, it sounds like a quirky blend of Terraria and in some ways Binding of Isaac. Some stuff is still pretty unclear, like what actual benefits your descendents get (or if they're all negative traits), what the castle honestly does and other things. But the game certainly looks promising.
Currently sitting in the Steam Greenlight queue, I can't find a homepage for the game other than there. So, no info on anything really other than that this game exists and can be available for sale should it get the votes.