It's hard to be brief when expressing my love for this game. Every time I try I end up vomiting entire text walls of praise.
Here's one thing i can say about Desktop Dungeons that I don't think I can honestly say about any other game: This is the only game where "1000+ hours to do everything" actually stands in the game's favour. No other game has actually compelled me to stick with it for so long without wanting to move on to something else and leave it behind. Nothing felt like padding in spite of the fact I've sunk in so many hours. I think this is an incredible accomplishment that very few games can claim: The core gameplay is so solid that it never grows old.
And definitely +1 on the community and dev team. This is the best place on the Internet to hang out by far!