I really hated the gameplay.
The five points you are getting have to do with the graphics, and the sound, which was well done. On the other hand, we have the gameplay, which is riddled with so many faults I didn't even want to make it past level one. First problem - The control slips. Most people probably don't notice it, but from what I've seen of the posts, enough people did. Second Problem: Enemy density. Normally, this density of enemies isn't that bad. However, given the strength of your starting weapons, and the high endurance of what are the 'beginning' enemies, It is almost impossible to make it through the game withought getting clusterf#$%ed by enemies, over and over. Third Problem: The weapons- This should never be a problem in a shooter game, but it was here. Three of the weapons proved useless in their lower levels, and you couldn't survive long enough to build them up. Finally, there's the shield. Quite frankly, your central gameplay mechanic is broken. If you are going to make a game where you will be unable to dodge enemy fire for Three seconds, you should make a shield that LASTS for three seconds. Instead, the shield lasts for about 1 second, then has reload time. It is impossible not to take damage, and I chalenge anyone to honestly play through without dying. Try and do better next time.