* As long as you stay in the circle it fills the bar (the flag turns to green) and the moment you left the circle it starts to decay. I agree these should be more obvious.
* Damage is calculated with the collision magnitude with some minimum and maximum caps.
* Still missing lots of feedback and juice. Death animation is one of them. Your 4 wheels dismantle when you die but still not very obvious, because they are so small.
* ACTION is Ctrl or Space in keyboard, and A button or button number 1 in gamepads. I always confuse what to write there, too many things to write in a limited area :D
Thanks for the suggestions, it is hard to come up with these on my own.