Bugfix: Tower Mode

I've uploaded a bugfix for players who are unable to play the Tower Modes (will give a empty screen if you have this)
You can get it by using the game's own patch feature, I won't update the installer at this point for this however.

Also included is a small update to the graphics, it should now be easier to play for color-blind people. As a side-effect it will be easier for non-color-blind people to play while under in-game the status effect "colorblind", if that makes any sense at all ^_^