If you enjoyed the original Space Invaders like I did (I spent a small fortune in the arcades on Space Invaders, competing agains friends to get the highest scores): This will definitely scratch an itch. You don't often see invader clones these days, so this one is very welcome. The graphic is basic and retro, but it fulfils it's aim. I like the addition of the power ups that drop from the ship that travels along the top of the arena if you manage to hit it.
In the oiginal this gave you extra lives or a large chunk of points.
Definitely worth downloading; if only to relive those glory days from the early days of game consoles. Apart from Pong and Breakout, this one was one of the very first arcade games I played regularily in the mid to late 1970's.
A big thank you to the developer for giving this away her eon Indie Gala.