I didn't really think about the placement of E, though I guess that you also have the arrow keys to move. As for the health I wanted to implement a red vignette and a heartbeat sound effect when the player was hit, because of how the damage system worked (you had 2 health points that regenerated after 10 seconds). I only made it so the player turned red when on 1 hit point. Unfortunately time wasn't merciful...
Thank you for the feedback and the kind words! Cheers!