Hey, thanks for the feedback. I actually never have a set time when you cant use the E key, if the player decides to press the E key at the start then they will waste all of the supplies they have and will eventually die before reaching the end. I feel its more organic having the player learn when or where to use them as feedback is given in a certain state.
I'll have a test adding feedback, I wanted feedback left to the minimum but there's no harm in seeing how it would change it :)