I am obsessed with the design of this game. I'm not familiar with the source material, but the design is genuinely so elegant. It is essentially a one-stat RPG, where the score you set for the character at the start of the game filters down through everything else you do - from your resources (HP/MP) to your combat style and your set of "class" powers.
I feel there is a lot of room to expand on this concept, particularly by giving more power lists, but overall it seems like a really fun little system.
If I had a point of criticism, the Encounters & Enemies section could do with a bit more description to make non-champion encounters feel interesting. That said, for a one-page solo RPG it is a stellar little piece of work. Really enjoyed reading and giving it a play about with.