good
You lack of super power stuff man, what the hell with just a non powerful shotgun? I want fire ball that take out half of the ufo energy, i wan't a big lazer that kills everything for 2/3 seconds(and some rest time to reload, else it would be too easy ^^) That guns remind me the gun of the FBi from alien hominicid, so remind me the graphics, but that's not a problem is it?
The music is good for the first time you listen to it and then it gets boring.
I think you should put some more things(weapons, music, background, or maybe a game like alien hominicid but with your farm? to be abble to change the background, you could call your game : contra farming 1) and if you do that i think your game will be a must play.
But hey that's good to waste a few minutes on that game! ++