Good, but...
I encountered one flaw with game. I bought the Uzi, then switched back to the pistol. However, when I tried selecting the Uzi again, I couldn't. While trying whatever I could to remedy this problem, I clicked on the menu button and it basically treated the shop menu as closed, even though it still looked open. The level countdown clock still continued, but I couldn't close the shop. Clicking on anything just fired my weapon.
Other than that, it was a fun game.