Show HN: Unflip – a puzzle game about XOR patterns of squares

If you're into retrocomputing, the C64 game Quadromania (1987) has similar gameplay:

https://archive.org/details/Quadromania_1987_CP_Verlag_de-en...

Interesting. It is very similar.

It took me a while to get past the instruction screen (I needed to press space, then "E" for english, then press escape) Now I can't seem to figure out the controls for the actual game.