Hell this is great, he's obviously got a genuine love for the genre and has created something something special, and got lucky enough to be noticed by enough people for word of mouth to spread. Again, people showing they'll pay when something is worth it, I imagine a lot of pirates sent in their five bucks too. (not to derail the thread)
As for why anyone could buy it when anyone could make a text adventure, I could make Half Life 3. It would have no sound, stick figures and be buggy as hell and last about 2 rooms, but I could do it, I'd prefer to pay someone else like Valve to do it well tho
I just hope the guy's been sensible with his profits, either investing some in a new game, or saving a fair bit.
Maybe he should put together a retail edition and slap it on Steam, for like $5.99. I was recently reading about Garry's Mod, and he said when they had it on a half price weekend, he sold over 10% of his lifetime sales, I think his sales went up like about 700% on the last day of the sale. (Yes I bought it)