Alien!
The alien is very cute. In the style of Alien Hominid. Along with the enimies, who were very cute, too. And is that, upbeat techno music to go along with the beating of innocent little invaders?
I had fun with the upgrade system. Well I woudn't call it an upgrade system it's more like a buying things system. Kind of like Toss the Turtle's shop, but you get my point. Oh and the +3 nades each win caught me off guard because I read it nads.
On to the bad parts. The enemies. Later in the game while I was killing the enimies after I killed one, and I mean right before, another spawned right above me. That was just aful because I had to collect the life points and money and then proceed to beat his head in.
When they got guns was bad. Simply because of, well, read above. In essence it is really good. I would enjoy of there were no borders to the game. Like if it was a huge planet, and you could run on in the same direction forever you know? Since it's called protect your planet. Not protect your patch of land.