Implement better wells and make the background black. The walls are chosen random between files wall_*.bmp (* = 0 to 7).
Move the slow area to the upper right corner so it's not in the way as much.
Breakable walls are now properly displayed again. Awaiting new skin for this wall for now.
Use an image as background and a minor update the TODO.
Players moving forward will now also check if the wall is visible in the collision detection handling when we change the Y position. Also properly place some code outside of the brackets made for pushing away enemies logic and remove two commented out useless lines.
Using Shift + T will now only cause explosions at the tanks that are still alive.