Thanks for playing. Related on what you ask:
1- Bad art :P I wanted to use some icon to make clear that the stamina only affects to the axe. Maybe a simple "E" from energy or "S" from stamina will be more clear
2- I use Chrome, I didn't check Firefox, I expected that work...
3- I didn't balancing the game very well, the days are more related to the narrative than the gameplay...
4- This was an idea I had (thats the reason of the islands) but I didn't have time during the jam to implement