Space marshals gameplay is built around stealth gameplay where the play sneaks around pre rendered stages trying to complete set mission requirements. There are rocks that can be used for distracting enemies as well as plenty of weapons including grenades.
Drop tanks and take over planets. Use the terrain to your advantage with hover tanks, or take the direct approach with heavy armor. Call in airstrikes from any starfighters that survived the space battle, or paint a target for your capital ships to bombard from orbit.