For some reason, also, you are unable to move on from the upgrade screen. Not quite sure why...
It just goes to the opening animation for it (the upgrade screen) and appears again.
Hmm... Having the ability to save your progress in a level would be nice, but might lower the difficulty of the game.
Wouldn't want that, now would we... ;)
I would very much like an option to brake using the left mouse button.
I'm aware that you can simply move the mouse closer to you to slow down, but that's not always an option in tight spaces.
As you slow down, odds are you'll move a little to the left, or to the right... Not always the best idea, especially in levels like E.
Simply clicking once to slow to a stop rapidly, sort of a Line Handbrake, would be wonderful.
Of course, there would be a precious second or two before you built up speed again...
 "Vulcan Siege")
 "Line Game"){kind=icon}