Neat little game. Quite addictive, actually. I've made a habit of playing it while listening to video essays.
One minor thing (spoilers?): I kind of expected a little more fanfare when you get through the whole game and finish the last puzzle. But it just loops around and takes you back to the tutorial and that's that. Might be nice to add a congratulations screen, where you can also plug stuff like "this was a game by Daniel Nora, here's my twitter, and here's some other games by me that you might like".
(I played the full Windows version, going up to puzzle 501, if that makes a difference.)