Very well done. THANK YOU for including a sound/music toggle.
Would be nice to have a way to bail out of a game back to the menu in case you screw up or want to swap modes.
Very smooth and nice. Only improvement would be if you could find music shifts for each level, so it gets progressively more complex or full, ending with big jazz. Great game!
1) add a HELP section to the menu [I'm in the middle of a campaign and can't remember some thing or another]
2) Add a RESTART CAMPAIGN button somewhere. If I ABANDON CAMPAIGN and then go back into it, I'm at the same level and with the same turrets as before.
Otherwise, GREAT work, excellent play, good writing, and fantastic graphics!