I found this interesting Rougelike game featuring mechs.
http://www.geocities.com/pyrrho12/programming/gearhead/index.html
Check out this Yahoo group for various info about the game
http://games.groups.yahoo.com/group/gearhead_dev/
You should also try Assault Suits Valken and Front Mission: Gun Hazard (both SFC.) Also, I’ve just recently released a translation for Cyber Knight 2, and it’s -way- better than even CK1’s awesomeness. So yeah!