Nice game. I was anticipating timing puzzles appearing... and they did, but they weren't overdone. It could have been very easy for those puzzles to ruin the game, but they didn't. Could use more levels. Very short.
Beat it with Boss, Ram, and Bad Boy in that order. This way you get 1 UAV and 2 Guided Missiles as passive abilities. Then you get Railgun, Rocket Launcher, and Minigun as your main weapons. I didn't even need any durability to win. Good luck.
You know there's too much grinding in a game when you realize the best way to play is to just keep replaying a level, while not controlling at all, letting the game play itself while you get a sandwich.