_Greenbar on the bottom screen: when this bar reaches zero, your mission will fail. Rescue animals and take down criminals to increase this bar
_Leveling up will increase health and base damage
_Mark Wester has a balance stats in all characters
_Azubuike Diallo has slower speed but has better health and grenade carry capacity
_Valentina Barnett has lower health but runs faster
_Elfire has the best health stats
_Tomz Shark is overall a superior character in term of stats
_Check your World Map to see enemy levels
_Don't fight difficult enemies when you are not ready
_Some people reported that Elfire has little chance hitting the chainsaw guys, but there is a trick in doing that. You just need to figure out how :)