You run around and kill stuff and improve your character.
Stats system is simple but interesting.
Combat has a lot of variety. You can choose how you want to fight – with a sword (there are fast and slow ones), a bow, or magic staffs (all 3 of them complement each other so nicely).
Enemies are all very different and original.
Each type of environment has its gimmicks or special obstacles, different enemies and bosses. You can even avoid environments you don't like most of the time.
The crafting system is something I haven't seen before; feels nice. Inventory management is quite a challenge. And it's the main reason why you can't be a jack of all trades.
Death is permanent, and this game really is quite hard; to the point where you may think you'll never beat it. But the amount you can improve is immense. And a good choice of unlockable items that give you different and, again, very original, traits, can make a big impact. But first you gotta unlock them, which requires doing additional challenges. Needless to say, they also add a lot to the gameplay.
This game doesn't go stale even after 30 hours.
Graphics look cool. Music is nice. (Feels similar to Terraria)
And there is multiplayer!
Gameplay also reminded me of Rogue Legacy