Waves or some special menace would make it better

I don't mind a simple game, but this has a couple of issues:
- It remains constantly the same. More and more aliens come, and there are different species, but it just gets more intense each moment till you die. Waves would be one option to make it more interesting. Another option would be some kind of more specific and threatening menace that you're hoping to avoid.
- Once most of the buildings are destroyed you can keep the basic aliens away by just shooting a bit above the last building(s). That makes playing the game feel stupid.
- The big bombs felt very powerless. For the regular enemies they are just more unhandy to use, but surprisingly they didn't really seem to be effective against those stronger ships either.
- At least I often find it difficult to enjoy a game where the controls are very restricted. So since you cannot move the cannon, there should be something really special to keep the player interested.

Good

Good game, but it could be better.

Unoriginal but fun to play

I know for a fact that I've played a few games with the exact same concept as this one, destroy the falling aliens before they blow up your defenses, but none the less, I enjoyed playing the game. Was well executed.

Needs some more work...

This submission, albeit BARELY, is still passable. It just needs some work. It shares the same kind of appeal as games like Missile Attack, but [this game] has no complexity to it WHATSOEVER. On the flip side, over-complexity can be burdening and a HUGE turn off in a flash game; HOWEVER, the lack of complexity thereof can be just as big of a buzz kill, too. So, overall, good effort, but it still needs some more kicks-ass-ness.

Simple game

It's simple and interesting as a defense, but nothing too much. I'd say there should be upgrades, different weapons, possibly allies. And divide the gameplay into waves.