I play a lot of nonogram/logicpic games, and this is honestly one of the more confusing interfaces I've encountered. I wish the icon for mark was a pencil rather than a slash. Or that maybe the toggle button was literally anything other than the key right next to X. I keep accidentally hitting X instead of C to toggle, since the icon is X, and then having to stop midpuzzle to try and remember what setting I'm on without clicking on the board and risking a failed pixel.
Other than that, though, I am really excited to see more games like this. I love the music and the aesthetic, and I'm looking forward to seeing what the harder levels are like.
 "Pixelo"){kind=icon}
 "Frontier"){kind=icon}
 "The Greedy Sponge"){kind=icon}