Huge potential, but quite gltchy.
I love the gameplay you have created with this! Very fun and addictive! I haven't got much time to write this review, so I'll summarise it. These are the main problems I found:
At any point in the game (even after losing all you lives!), you can right click and select "forward" to restart the level.
On a few levels, the enemies respawn in places that put you in instant danger - so you die before having any chance to defend yourself.
Enemies that shoot automatically start firing too early - they should only start spinning and firing when everything else moves, not fire horizontally while it all loads.
On one level, one of the enemies appeared outside the game boundaries... by using the right click+forward glitch, I kept replaying the level (with the original intention to just get all the weapons) until on my fourth or fifth time round it the bug disappeared...
I don't think you've got the weapons ordered in price very well - I think the best weapon is the maxed-out no. 2 weapon (with the only exception of the final weapon) - I didn't think weapon number 3 was very good.
Big problem: LAG! Even with the quality setting on low, the game lagged a LOT with powerful weapons on high levels. Especially with the final weapon.
The images for "1" and "0" lives are the wrong way round. WHen you have 1 life left, the number "0" shows up, and vice versa.
I didn't quite finish the game, as I died and couldn't be bothered to cheat and restart the level 2 rounds from the end... oh well. Amazing game! I can see this going a very logn way if you tweak it a bit.
Hmm, that came out a bit longer than I expected...