Since the gun doesn't fire while missiles are in the air, upgrading it seems fairly pointless. Better documentation is needed. I didn't figure out how to fire more than one missile at a time until partway through the 4th level.
Overall, a bit simplistic and not worth playing more than once.
Not bad, but nowhere near worth paying for. Take your sponsorship revenue and call it good. Don't try to squeeze more from people unless you can make a truly excellent game.
It sucks when the legendary shop disappears before I can enter because it is right at the end of the level. Get rid of the "can't pick up bonus" noise. When I have the Bonus Magnet, the noise plays constantly due to all the armor bonuses following me around. The first time I got to the end of level 14, the boss never appeared. I had picked up a 3M gold bonus on the level, so reloading was particularly frustrating. Otherwise good.
There didn't seem to be much point in buying anything other than the best manual and automatic turret. Overheat mechanic provided a nice challenge. Game ended before I finished upgrading. I would have liked to continue on to see what it was like with full upgrades.
The voice acting is pretty hit-and-miss. Ira was good, Johnathan was really bad. Others varied.
This was seriously supposed to share Xian values or something? You really need to rethink your strategy.