I don’t think it’s that short if you factor in the completion aspect. Getting both endings took me 7 hours, and completing will probably be another 12 if I choose to go that route.
For $25 I don’t think it’s that bad, but I’m pretty biased in preference of quality to quantity.
I think that’s fair. Though I do think fizzling out is kind of in the spirit of a proper Lovecraft horror.