There are 2 posts tagged with Raiden (Series) here.
Raiden II is a shoot 'em up originally released in 1994 to the arcades where you'll you must fight hundreds of enemy crafts and this time destroy them for good. Here we have its online version.
Sand Scorpion - Sasori is a vertical scrolling shoot 'em from 1992 that we have here in its browser version. It's a pretty standard game of the genre, mixing unique elements with a very Raiden-like gameplay.
Super Sergeant is an FPS where your mission is to destroy all enemy forces using different types of weapons and find the exit on each level.