Hello. Answering the question in the title: You can't, this game is endless. Are you still here? Good, ill tell you how to beat more enemies than you do now! 

1) Take a good look at all your abilities, and how you can combo them.

2) Abuse jumping, it really helps!

3) Misslead AI - AI is very simple, it won't turn if you are standing very close, and it also won't turn very fast, so jump in a different direction to win!

4) Attack while jumping - it will let you heal later!

5) Don't let enemy forces gain power in numbers - they will be deadly!

6) Use your spirit form to kill huge stacks! More HP won't hurt you :) 

7) Don't lose control over the game, or you will die very fast!

8) Learn how to block without losing tempo! Enemies deal 1/7 dmg to you while blocking!

Annnnnd... THATS IT!

See you in the forest friends!

Grzegorz Kasjaniuk - Main Developer