What a puzzle game! I really liked the "feel" of it - with that press going down every time you managed it. It got a bit tedious over time, but first few levels were very engaging.
The most irritating part was how hard it was to cut close to the metal - it kept saying that I couldn't cut the metal, while I knew it but was trying to cut as close as possible. Would be nice to have some approximator for this - to cut at the closest proximity when you slightly touch the metal. Although I sometimes felt you had this - I just fished the window for that was larger.