There is a house in New Orleans they call the Super House of Dead Ninjas!
No, there isn't...probably, but on Steam there is and it's fantastic!
You're a ninja and you do what a ninja does best: run and jump around and kill stuff!
You make your way down a tower (not a house), kill a lot of different enemies, face bosses and traps!
But don't forget to keep an eye on the timer or death will come for you!
And if you're not happy with your current loadout, take on one of many challenges to unlock more weapons, items you can find on the levels and costumes!
It's basically a platformer with randomized levels and enemy positions, a lot of different items to unlock and use, simple yet addictive gameplay and even a level editor.
While most enemies die with a single hit, some need more and some may even pose a threat after their demise...
Kill enough baddies in a row and you enter rage, where you kill everything with a single hit and are invincible as long as you keep your rage, which you do by killing more enemies! Simple, right?
But be aware that after losing all your health, your run will end and you will have to start from the top of the tower (in hard mode; in normal you can start from "checkpoints" after boss fights).
SHDN is a bit of Spelunky, Super Meat Boy and the Binding of Isaac and it's absolutely great!
If you're into platformers with fast gameplay, some rogue-like elements and a lot of stuff to do, this might be for you.