The game I've been working on for the past year and a half has now been released!
Fake Illusions adds gameplay to a number of optical illusions, by introducing a "cheating" illusion that's actually longer or smaller. Sometimes distractions are thrown into the mix as well. There are ten different illusions (with more in development!), 50+ levels, and I designed the game to be very accessible. It's easy to play together behind the same screen, and you can save your favorite puzzles as GIFs after solving!
If you want to see more of this game, check out some GIFs. Want more? The @FakeIllusionBot shares a puzzle from the game daily.