Add a timer in seconds to the right bottom corner of the screen which properly pauses when the game is paused.
Get rid of a TODO I'm never going to complete anyway and also get rid of bronze and silver coin images.
Implement public class called FloatingTile used by classes like Coin which simply move up and down 20 pixels - will be needed in near future (wrote this while on laptop on way to home and turned out to not have enough time for full implementation which I will therefore finish later on).
Implement the spike tile - does pretty much the same as the lava tile.
The water and lava tiles are now hit when the character actually visually hits the object rather than when hitting 25 pixels above the tile (which was a transparent field of pixels in order to get it positioned correctly).
Pre-load bullet images when we load the level rather than loading the image everytime we shoot.