Even though the game supports arbitrary window resolutions, only 800x600 and below are fully usable because of some display issues:
The somewhat hacky method for parallax effect currently always assumes a height of 600px and so the horizon will just be blank at the top and at the bottom.
The width of the view is only set up when the level is loaded and not updated when the window size changes.
Even though the game supports arbitrary window resolutions, only 800x600 and below are fully usable because of some display issues: