Photopia is an example of the moving literature IF can strive toward. It is a remarkable game, moving story, and well thought out.
It is true that the story arc is rather linear, and there are few puzzles. However, I have no complaints about this. Books are completely linear and I find no fault with the work of Faulkner or Morrison or Shakespeare.
The changing point-of-view kept me on my toes the entire time and the end remained a surprise.
And yes, it made me cry too. the only IF to effect me that deeply emotionally.