This was absolutely delightful. I rarely play puzzle games, and I love them even less frequently. But I really loved this; and gladly saw it through to completion.
The entire concept is excellent and well implemented, it's simple enough that you need next to no tutorialisation, but there's plenty of depth to the level design, even though you were limited to certain shapes.
I loved how you subverted expectations with the levels around half way through, the format wasn't getting stale for me or anything, but that change really did keep everything extra fresh.
I encountered one small bug on 45 where I got stuck in an infinite loop, I have recorded this if you'd like me to share what it looks like. However reloading fixed it (thank you for adding save games!!)
Artistically it's spot on, really looks exactly like an old backlit monochrome LCD.
Thank you. I enjoyed this greatly.