This is a very nice game. Simple and nothing new but very well executed.
The graphics, eventhough nothing too spectacular, looked sharp and clean. The game menu was very well placed and the upgrades easy to spot.
I especially like the pause effect when scrolling through the menu.
What you could improve:
- Add some more variety into the game like power ups or something.
- Maybe add some kind of tactical value? I just hold the mouse and spammed bullets to victory.
- Addionally to the enemies add some obstacles (like moving walls or something) so the player is forced to move around them to hit the enemy. I mainly just stayed in the gamecenter and killed everyone.
Overall I would give this game a 7 out of 10. The emphasis lies on "would".
Since you just low- scored my game without any constructive criticism what-so-ever I'll return the favour.
2 points it is, pal.