Chuubo's Marvelous Wish-Granting Engine is a very eccentric, wonderful game.
It is eccentric due to the author Jenna Moran's delightfully whimsical-yet-sometimes-dead-serious narrative voice; because of her nonsensical-yet-oddly-prescient style of writing that makes her occasionally seem like some sort of holy prophet.
It is a wonderful game because it treats you like an equal who can help build and change the world with the tools that it gives you. Few other games give the player the power to viscerally change the way things work within it; no other game, that I know, succeeds so well in mixing its setting elements with the mechanics - from how the world is metaphysically different in some locations, to how despair can be fought in a variety of ways.
If you are a player very familiar with traditional rpgs like D&D, you might have difficulty adapting; Jenna's style can be counterintuitive at times, and there might be a few moments where you'll think to yourself, 'how is this supposed to work?'. The system's format of roleplaying-for-XP, quest-solving-to-get-powers, and explicit character arcs might in some ways be easier to approach for newcomers to roleplaying in general, as they challenge a lot of assumptions hardened gamers may have.
In truth, I cannot say this is a game for everyone. But if it is for you, you'll surely love it. If not, then it at least is a damn good read.
[5 of 5 Stars!]