You should kill those more difficult enemies rather than killing those easy to kill enemies.
More difficult enemies means more damage they can do to you, so you need to eliminate who's threat and finish it as soon as possible.
Tip #2: Tanking Damage
When the mob appears, you can't escape or avoid their attacks.
However you can tank those damage but you should only tank those damage that aren't powerful enough.
Follow the tip #1, if you are moving forward or backward, focus your attack on enemies that deals high damage, then proceed to tank the remaining enemies attacks.
Tip #3: Play as you can
This game doesn't have a stamina feature which can be found at most mobile games.
Stamina feature gives you a certain amount of restriction playing time.
In this game, you can play all you want. No restriction, just play and improve your characters any time.
Tip #4: Boss Hunting
Since it doesn't have stamina feature in this game. You can play any levels you want to play!
If you are experience beating your current level, play boss level instead.
Boss level gives rare items with a low drop percentage but you can play as much.
Improve your character first from boss levels before you can beat your current level.
How to play without annoying ads? (No Ads Cheats)
Playing Stickman & Gun 2 game is sometimes annoying because of intrusive ads, ads that may appear out of nowhere, ads that may block or occupy entire screen, Fortunately I have a (No Ads) cheat for you to use and play your Stickman & Gun 2 game without those pesky annoying ads :)
You should turn off your WIFI/3G/LTE internet connection before you can open or launch your Stickman & Gun 2 game. If you already launched the Stickman & Gun 2 game, just force close or go to your multitask (Android: Multitask button, iOS: Double Tap Home Button) and swipe it out to force close the game.