In the past, our attack against the humans failed, but this time, we won’t fail. You must fight off humanity’s defense lines, but beware; they have built a special energy field that will try to make you dizzy! Everything will be much harder than a common arcade shooter game…

Instructions

P or space bar – pause game
M and N – Mute music and Sfx
Arrow keys – Move
S – Shot
D – Drop bomb

There are extra instructions in-game.