I suggest that a firing range is added where you can test weapons that you don't have or the weapons you have so a person can experience the fire rate and/or get used to the iron sight and practice aiming with guns from unlocked sets. This could help players determine what gun to buy.
Always fun to hunt for those stars just to find out they were hidden in such an obvious spot that you missed them and I love games that you can lose without getting pissed off. The easy to understand gameplay and simplicity of it are the keys to that aspect. :D However (this isn't even a copmplaint, just a suggestion) I agree with chaosqasket about the 3rd mini-game (requiring 50 stars). If I could add one thing, it would be a "done" button to end the mini-game right then.
 "Contract Wars"){kind=icon}
 "Snail Bob 5: Love Story"){kind=icon}