a/ a proximity mine, that explodes when player is near.
b/ a destroyer, that fires a highly accurate railgun at the player.
c/ a drone, fast moving twin lazer gun green alien
what else to do, how will they look? what weapons do they have? how do they move?
im looking at adding one that shoots a tractor beam that slows the player down, as a pack of dogfighters (think defender/stargate).
name some of your favorite aliens from previous shootemups