FastCrawl is what the name suggests: a quick-playing dungeon crawler, perfect for a way to kill your lunch hour. One of the parameters you set at game-start, in fact, is whether you want a short, medium, or long game; short ones last about 30 minutes, while long ones last perhaps an hour.
The gameplay is Rogue-like, except that this is, of course, a game with an intuitive 2D interface with decent graphics, playable almost entirely with a mouse--almost like a NetHack designed for the casual game crowd. Dungeons, opponents, and items are randomly generated each time; each turn consumes a unit of supply, and while you can find more in the dungeon, the net effect is to limit the length of gameplay. And unlike most Rogue-likes, you control a party of characters instead of a single one. All in all, a nice, fast-playing hack'n'slash experience.