Very nice!
I like the light and dark effects :)
Like andy_mc mentioned, I think if the UFOs were doing something like abducting people or cows or whatever and you had to shoot them down before they fly away, it would be fun and add a sense of urgency.
Some ideas:
> Variety of weapons and powerups
> Different alien ships, some abduct, some shoot back, some invisible etc
> Alien mothership or something as a boss?
> Alternative mode to play AS the aliens
> Unlockable 'Grey Alien' character ;o)
I like the light and dark effects :)
Like andy_mc mentioned, I think if the UFOs were doing something like abducting people or cows or whatever and you had to shoot them down before they fly away, it would be fun and add a sense of urgency.
Some ideas:
> Variety of weapons and powerups
> Different alien ships, some abduct, some shoot back, some invisible etc
> Alien mothership or something as a boss?
> Alternative mode to play AS the aliens
> Unlockable 'Grey Alien' character ;o)