A decent game, nice graphics / weapons / enemies variety. I also liked it that there were several sectors with different gun placements.
I nearly gave it a 6 or less when I played the second time and found that I have to start from scratch... But that was apparently due to the fix for the logo bug being uploaded. +1 for fixing stuff :)
I did notice some bugs and annoying behaviors though. If I pause the game and decide to return to the main menu, the main gun is destroyed, but I remain in the pause screen... When loading a game, I get right to the battle screen, and can't shop; on the other hand, support units can only be build in the battle screen and cannot be repaired. The World Savior and Boss Destroyer awards didn't work, and the penetrating weapon - I don't remember its name - has a fire rate nowhere near 20. And if I get back to a previous weapon I pay for it again. Overall, quite a few shortcomings, which if fixed can make this a really good game.