Thanks for trying out the game!
The tutorial was on the plan but regrettably I have to remove it due to the time constraint. :(
So I tried to explain as much as I can after the submission trying to hijack the jam rulesI also designed the controls in a way that is easy to memorize even though the design is unorthodox.
I think you don't have to over-optimize the green and red bars as long as you are conscious that you should not hold the red bar too long.
Red bar actually boosts the speed of green bar filling.