Tip: Green = slow-motion, Red = Ammo, Pink = Sticky, Blue = Larger Paddle.
Another tip: If you have Sticky Paddle, do not collect a Slow-Motion (green) powerup because it limits your time for Sticky Paddle. Save up your ammo unless you need it really bad.
@TheBlunty that is correct, but they've made an update and now you get titles for buying things in the shop, and since it is currently Christmastime, you can get titles for giving gifts to other mice.
 "Obey the Game"){kind=icon}
 "Super Stacker 2"){kind=icon}
 "Everybody Edits"){kind=icon}
 "John the Button"){kind=icon}
 "Virtual Cat"){kind=icon}
 "Pwong 2"){kind=icon}
 "Transformice"){kind=icon}
 "Interactive Buddy"){kind=icon}
 "Catch a Shit 2"){kind=icon}
 "Achievement Unlocked 2"){kind=icon}
 "Light People on Fire"){kind=icon}
 "Lucky Tower"){kind=icon}
 "Haunt the House"){kind=icon}
 "G-Switch"){kind=icon}
 "Reincarnation: ADDO"){kind=icon}