I like puzzle games like that. I think it is a cool idea.
But somehow I could not do anything in level 4.
Is there a bug or did I do something wrong?
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Hi, thank you for commenting! Not sure if there was a bug, I haven't encountered one on that level but that doesn't mean much. If there wasn't, hint for level 4--look for a 3x3 pattern that you inverted in levels 1-3. Then after you invert it, see if you can find anything else that looks like that pattern and try to invert that!
Btw loved your game, it brought me back to old Flash games in the best way