+ - Possible solution: reduce Tux's width when checking collision with tiles
+[H] Graphics
+ - New forest tileset
+ - Badguy sprites
+ - Tux's buttjump animation
+[H] Backgrounds should be square tiles instead of just tiling one image
+ - Useful for vertical scrolling when we only want a sky background on the
+ top of the level
+ - Support for this is already available using a paralax tilemap layer
+[H] Background code have the following bugs:
+ - Gradient in software rendering doesn't currently work (at least here).
+ - Images tiling code sucks resulting in glitches and unecessary drawings.