This is a solid game. Visuals and sound fit well and is definitely reminiscent of the space invaders days. Unfortunately, the game is tough. I took me a while to figure out how and when to use the shield but after I did, that mechanic made the game much more interesting. The biggest downside I feel is that, as a player, you want to eliminate all the enemies but they are incredibly difficult to kill. One change that I would be welcome (I think) is the ability to shoot backwards, as most of the time I was in the mid to upper portion of the screen just dodging.
I could never kill the boss as I kept dying. I tried the game about 10 times with my score getting progressively lower and lower just to play it safe and survive with full health. It's well made and fun in spite of the difficultly. --Azroix