Gave it 3/5. Would have given it a 4, except for 2 things:
1) making us pick up coins. It's old, stupid, and annoying - stop making us pick up coins, people!
2) Needs an autofire (unless I missed it somewhere?) holding down the mouse button for extended periods of time is not good for you.
Definitely not up to the standards of the first. Gave up after getting the fourth key. Just too much precision timing with infinitely respawning enemies and others shooting at you, not to mention that as soon as you use the cat they run right at you. If you long for the old days of '80s arcade difficulty, I guess this is for you. I'm eternally thankful those frustrating times are behind us...
Needs: Better controls. Drag & drop is not a good idea for this. Also desperately needs a tutorial of some sort, instead of just throwing you into the game. Also, to get money to do pretty much anything requires grinding through the same matches again & again. I know it's fairly common in games, but I personally HATE grinding.
And of course as everyone else mentions, better AI. The bots currently have the attention span of a hyperactive gerbil. They'll also be right next to an enemy & not shoot...