Great game! For me, few puzzle games can combine a challenge, while also retaining my focus. This managed to do just that. I love the concept and the minimalist graphics, and the music, it suits it well. One thing that I especially love is the ease of re-doing a puzzle, the individual undo option makes it a lot less frustrating since you can easily fix it. Overall, I think it's solidly done, and I look forward to more!