To know which ending you are going to get, you have to max-out or not, your Heart count (999 hears), Health Blocks (five blocks), Arrow Power (five arrows), and Enchanted Weapons (three weapons).

Ending	How to unlock
1- Best Ending	Have four stats maxed out.
2- Grown Angel Ending	Have three stats maxed out.
3- Captain Ending	Have two stats maxed out.
4- Guard Ending	Have one stat maxed out.
5- Farmer Ending	Have zero stats maxed out.