Very interesting idea, interesting (while minimalistic) visuals, and an enjoyable active puzzle experience.
Very difficult (by design), and very engaging, however the solutions often spike heavily in difficulty and are not always immediately clear. Difficulty is fine, obfuscated results are fine, but having both (in an uneven difficulty curve), sours the gameplay experience a little on occasion.
"Autoaim" took a little while to get used to, but once used to it, was easy enough to handle.