Tired of it.
I played for a damn long time. It's fun, but there are some serious problems. One, as has been mentioned, the grammar and general use of english is pure crap. Reading your description of the game, I would've expected substantially better.
Another is that the weapons are all locked, with no explanation on what it takes to unlock them. If I knew, I probably would've kept playing, but after I have 100000 gold saved up, I really feel like I ought to be able to buy it. Especially since I have 100000 gold solely because I keep getting killed because the weapons aren't strong enough.
I saw no appreciable difference from upgrading the attack energy or shield, but perhaps a description of what the affect of the upgrade is would be in order.
Finally, the only real flaw that isn't just poor planning is that if you are targeted on something, say, a stationary turret in the 4th chapter with tons of guys swarming around, if you go overdrive, it changes your selection to the nearest thing, as if you had pressed W. That got really annoying and was in part the cause of my early demise.
If those things were different, I might actually have played through and beat the game, but I ended up having no desire to, due to these problems.