Modern Space Invaders - This is my take on the old space invaders. It's actually quite good :) Starts slow, speed up and gets quite difficult. [left] and [right] to move [space] to fire. You can't shoot an invader changing it's position as it slips down.
Graphics by me, code by me, sound is something I half inched from a great version by https://scratch.mit.edu/users/codergeek/ because you just need that sound and he had it right! Remix it if you want as there are plenty of things to build upon, just mention me