This might be the most time I've spent on any one submission, I really really enjoyed it. I got stumped on a stage somewhere in the middle and then on the last stage, but because the mechanics are so simple I knew I'd be able to figure it out and kept trying. The undo button helps prevent any kind of frustration and I was pleasantly surprised to find that the undo button even undoes restarts for those accidental button presses. There are a lot of stages here and the difficulty curve felt almost perfect which I've learned is a very difficult thing to do so I really appreciate it. The simplistic visuals really compliment the mechanics and gave me nostalgia of playing ms-dos games on my first pc.