I finally found it https://www.increpare.com/game/gestalt_os.html

Found it https://www.increpare.com/game/gestalt_os.html

Found it https://www.increpare.com/game/gestalt_os.html

Ok, thanks to your link, and searching related games, I found it : https://games.increpare.com/Gestalt_OS/

Thanks, but it’s not this game. The visual style is pixelated, and blue purple colors.

Yea I was thinking about this !