Idea was cool
I liked the idea of a giant barrier made for crashing into, i didn't like how the sfx was built into the music, i didn't like how you could kill your own ships, and i didn't like how there was no upgrades. Maybe fix these? I'd like it if there was a Planet defense 2 with those changes fixed, also, you should be able to sell your turrets, for half of what you paid, or all.