A straight-to-the-point remake of a venerable top-down shooter, with a nice audiovisual upgrade and a hefty boost to difficulty.
If you're looking for a challenge, this will certainly deliver - not only are the aliens faster and more trigger-happy than in the '78 classic, missing your shot or having it blocked will leave you unable to fire for longer than if you hit your target, punishing sloppy aiming.
Its a major shame Miniclip's long-dead, but at least this is still playable.