Sorry for my mean comment. BUT!
1- There is NO RESET BUTTON at skill point tree, we don't have to start over to change our build. Skill tree should be improved, the path most players will select is quite obvious, there should be more variety.
2- Why are the orcs always the bad guys :(, and what the heck do the bats do in the orc universe? And I think Evil guy doesn't fit the scenario also.
3- SURVIVAL MODE is absolute madness, at 650 there is no place to move, there are full of bats, projectiles and etc. Also, it would be great there is a chance that the mobs drop life and mana potion (+crit, evasion potion etc.)
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For hard badge achievement:
focus on the BATS: They are real pain, always chasing you.
Use your W / STUN: It will really help you to stun rangers and bats to survive.
Prioratize upgrading holy skill tree in terms of healing, you will help healing all the time.