Thanks for playing Kevin!
The blue text was on my list, but unfortunately I didn't get to it in time. Generally speaking you can just chug all of the potions you pickup and the result is an overall net gain in stats. I added some additional functionality to facilitate this, you can just spam click the use on button.
The speed calculation does determine who goes first, but if I recall correctly it only determines the order between you and the enemies, not your own team.
I am aware of the player being able to attack multiple times if they are fast enough, let's call it a 'feature' to reward fast clicks ;P
Did you manage to beat the game? So far I am only aware of three people who have managed to defeat the end boss.