Acceleration is the first level to contain a Gauss Cannon, which can be useful for eliminating Hornet Spawn. However, the trigger for this and many other powerups is hidden.
You have to acquire a blue keycard, and then you must blow two switches, and then another two. After this, you will have access to the reactor.
Keep on a lookout for weapons like the Quad Laser, Gauss and Afterburner.