I agree, too short. I really like the upgrade system. The fact that you have to beat another scout cloud to the star, then get it back to your cloud safely is unique. I didn't know how to use upgrades for a few levels until I read gobeproductive's comment.
Love the game. I enjoy the fact that your placements/upgrades are permanent through the game and the only money you spend is on the unlock/upgrade, not per unit. I do have a suggestion, also: If you have max units on the field, and your unit bank is full, you should be able to swap out one on the field for one in the bank without having to pay to upgrade max unit/unit bank.
It would also help that if I accidentally move down a pixel, and back up, the laser picks up where it lefts off (I.E. if it takes 5 seconds to destroy an enemy/cut through a rock, and I accidentally move down after three seconds, it should only take two seconds when I re-calibrate myself, not five.).
One very annoying thing (especially in level before boss): If you're hit mid-jump, you can't jump again until you land. I got hit fairly high up on the level I mentioned, and got knocked back/down a really long way before I landed on the next platform on the left side.
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Indeed you are, and may I say that you are incredibly good at it.