Rogue Legacy 2

I remember buying the original on Steam and having a lot of fun with it, and randomly going back to play it now and again.

The sequel improves it in every way — way better graphics and animation quality, better level design, more classes, more abilities, more and funnier traits. (My favorite is IBS where you have a chance to fart with every jump and the farts deal some damage to nearby NPCs. Just like in real life.)