It's been done
A dull copy of crimsonland
I admire that you took the time to try to recreate such a game, but I gotta say, your upgrade system is a little wack, because it doesn't bring anything new to the style. plus, there are fewer guns than the real game; I just can't get into the game when it's just a carbon copy with a few barely acknowledgeable new bells and whistles.
However, you made the effort, and you are obviously not an inept programmer(s); I'm only giving this a lower score because I want you to try harder. seriously, if you need more ideas, you can contact me for anything; let's see this get off the ground into something real.
-Richard