** Made minor changes that I hope will help a bit.
Some help for the aiming 'till its done.. Any enemies that stop in front of you (all but pink) will stop at the same depth level as your cursor so you are able to just hold the cursor right over them and you'll hit them. When enemies are moving you'll have to line the shots up since the game is using a single point perspective.
The full title of this didn't fit in the title box. It should read:
'Intergalactic supernova solar strike defender vs The evil giant one eyed space crab of doom'!
Seems its not clear enough, so until I find away to make it more obvious..
Your weapons do no damage to the bosses armour, and you can fly in front of him after he has stopped when he rushes at you.
Beat a giant space crab and earn medals in this 'into screen' shooter!
Default - mouse aim/shoot + WASD
or Arrow Keys + Space Bar
Z - BIG BOMB, P - pause.
Note: You can change the sensitivity of the aiming cursor in the options menu on the pause screen,as well as other settings. faster the better! as it'll avoid your cursor going off screen.
If your cursor does starts to go off screen, best way to re-centre it is to pause (press P) and click the resume button.
Enjoy the show.