Excellent!
It was a fantastic game! The controls responded well to me, and I loved the auxiliary powers and the customization!
However, there were a few problems.
I agree that there is a problem with balancing; mostly in the purchase options. It is simply impossible to get a most of the upgrades/weapons/modules without the "secret" at the end.
Also, once I used the "secret" the close button on at the hanger screen wouldn't work, trapping me in the hanger. This specifically happened during the second level, but also sometimes at other levels when I opened the hanger using the "secret." This persisted into my subsequent save files.
It's an excellent game, but it was unplayable after the hanger problem came up. (couldn't get past second level normally.)