Strafe a lot when you're against shooting robots.
When your laser power is low, switch to the machine
gun until your laser recharges.
Save your missiles for the bosses.
Find Custom Circuits and Highpolymer Liquid to upgrade
your Protect Armor.
Use Roller Dash to speed up and to break away from tight
situation. Don't shoot Napalm Launchers close or you might
risk taking damages.
Save immediately after completing a mission.