Aim Shoot all the aliens, and then destroy the Mothership.
Red weapons work better on red aliens, Blue weapons work better on blue aliens.
With enough jewels collected you can buy upgrades.
Collect the various powerups to help you.
mouse controls movement, mousebutton reverse direction
'1' = health. 5 jewels
'2' = extra jewel collector. 15 jewels
'3' = upgrade current weapon. 50 jewels
'4' = extra spaceship. 150 jewels