Very entertaining, I really liked it a lot!
I always liked Space Invaders, and you gave it a very interesting turn.
The gameplay responds very well and is really addictive.
I loved the 3D effect you did and the music is just phenomenal!
There's a glitch in the menu screen; if you select the game mode (manual or automatic) with the cursor, it behaves in a strange manner. The truth this is not something that affects the gameplay or the game itself, so, meh.
You really did a good job! :D
(Sorry for my bad English)