Thunderforce games are great fun
I also have streets of rage 1 + 2 and they are excellent in two player mode, I would like streets of rage 3 but its so hard to find it at a decent price
I also enjoy cyborg justice, a robot bashing brawler where your always upgrading your parts from the other robots you destroy, its kinda like streets of rage but in the future in a different world (i think?) with cyborgs