Display different HUD icons for speed and invisibility powerups
Currently, when you have collected one of the Speed and Invisibility powerups (InstaGib), the HUD will display an icon and the remaining time for the active powerup.
However, the icons are not unique. The Speed icon is the same as for Shield (green triangle thingie), and the Invisibility icon is the same as for Strength (orange fist).
I suggest to use unique HUD icons for these two powerups.