Shining example of a good parody.
You've accurately captured the very essence of what Rogue Legacy is whilst managing to make it hilarious at the same time. Every joke and gag from Charon to the monsters to the boss are all a real part of the game. You show something of an inner dialogue of the player as they go through their quest by killing each foe in a humorous way. Even the ending had a basis on the real game mechanics.
It's easier said than done, as many parodies find themselves straying from the path of the game and into something that isn't so much a parody as it is a collection of inside jokes and memes. Sometimes going so far as bringing a character from another series into it in order to keep it entertaining.
This is a solid 5/5 10/10. It was well executed and lacked the filler often added to 'fluff up' the run-time of an animation. Rogue Legacy is also an amazing game. I would recommend it to anyone who enjoyed this animation.
I look forward to seeing more of your work.