Inventory needs some serious work. Why color code the loot drops if they don't correspond to what shows once picked up? Also, an item sort would be extremely helpful. Thanks for the magnet at least. :)
Is the "gauge" in the top left meant to do anything? Otherwise the pausing during buys is much better...now for a hard mode...hehe. The main bug I found was buying 4-5 turrets at once and experiencing a crash. I buy more turrets and it goes back to normal. The flying doesn't really need any tweaking as it is quite good, though a height increase would be appreciated so we aren't "bouncing off the sky" so much. Also, the supertank at the end might be better served with the same stats but a bit smaller. I just dump turrets in front of it and never actually have it on screen. Perhaps even able to blow up certain sections of it maybe?
Has potential, but difficulty either needs to be adjustable or lowered. Tanks come way too early and have too much armor. I agree that game should pause when buying or upgrading. The latter alone would make for a better game.