Well, I liked it. Simple play through, nicely put together secret, I think someone else described it as a 'snack' and it's certainly a wholesome one. A map to be proud of.
Only thing I'd quibble with is the placement of the buttons. If it opens a door, then I like it to 'make sense' - not sure why someone would put a button up the top of the wall like that. But I'm getting picky, this is really worth a download and quick play through - on nightmare.