I think that the difficulty accurately gives "insight" to ALS, but I'm not sure that pixelated hamsters who make little farting noises when they talk is the best way to do it.
My grandmother, who had Parkinson's (another degenerative nervous system disease), experienced severely slurred speech. I understand ALS does the same thing, so I'm not sure him having a conversation moments before collapsing is the best way to depict it. Also, it all happened in the span of a trip to the grocery store, dafuq?
I do have to give you major props for making it map playable relative to your current condition status. This has excellent game design, and the insight it does offer is how it "feels" to progressively lose physical abilities.
Anyway, the game was pretty good game wise, and I'm sure it will raise a lot of awareness. That's how you cure diseases. When enough people are aware of them, they become cured. That's why cancer and AIDS are gone now.
:D