It should be fixed now—when you have a moment, please try the demo again!
If it still doesn’t work, you can press F10 to disable post-processing entirely.
(On the web version, go fullscreen first, then press F10.)
Okay, both versions now works with F10, but with some issues.
- The background is completely white, making it quite difficult to see anything.
- When you start sector 1, the entire image freezes. Pressing the buttons above (which you can't see) unfreezes and you can play, although there are many enemies.
SCREENSHOTS!

