The art is very good and the concept is nice but it does have a lot of gameplay issues like the negative bullets and the unexplained upgrades. I'd like to see this turn from a demo into a real game. Good design though.

You can continuously go into negative currency to keep buying stuff, if you fire too fast then you run out of ammo but it doesn't count towards your bullets shot, the shop doesn't list how much money the upgrade is. Very cool concept, but not very well implemented.

after the third upgrade to the weapon, the guns sound and animations completely stop, the game has a currency but it doesn't properly work though, you can continuously buy and go in the negative and it does not say the amount that it needs for the purchases.