not a bad game on its own. I do think there really should be undo and a keybind to restart but the levels are small enough to not be too much of a problem. There is a bug with lasers in level 1-21: if the orange cube moves out of the way of a laser but not the blue cube, the blue cube will survive.
edit: 100% the current campaign, some shortest path values are off by one unit from what I managed to get, which is ok, with one exception. level 2-13 can be done in six moves instead of twelve.
it's also a little weird being booted to the next level after solving this level when I only care about this level, though it is a nice effect and maybe you should have a menu popup asking if you want to restart or proceed