Played this for a couple of hours, I didn't enjoy the game that much. Tutorial was pretty boring, and the game doesn't catch your eye too well. I didn't find any bugs in the time I played it, it just wasnt for me, so I'll give it a 2/5 for not liking it.
Something that helped me with the critical training: Move your mouse to the scarecrows top hat, it makes you look at the area instead of using muscle memory.
A 4.04 rating isn't something you can complain about. It's better than most games on kongregate. I rated it a 3/5 because I "Liked it" It's a good game, but it's most certainly not my favorite. I would be content 422k people "liked" my game.
You should revise the amount to get silver, on some of the earlier levels when it only takes 1 or 2 shots, and silver is 4, maybe knock it down to 3, Also, Instead of skipping on click at the intro, maybe a skip button? I was chatting, then click on my game and skipped the animation. But other than that so far I think it's great.
Super Shocker, I suggest using the hunter, or whatever the human version of it is, because it has 6 slots for weapons, and its a great sniper ship, just hyperspace to a threat 1 area and farm kills till you only have one life left, then hyper/overdrive back to the nearest base.
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Good ideas... ta.