This is a punishingly difficult game. I love the way it looks, I love the idea, I love everything about it... but the welding itself? Like lafferty mentions below, it's really frustrating and hard to handle the cooling behaviour. I found this especially difficult once the Stick welds came in. I also took forever to figure out what that UI was meant to be telling me, which seemed odd in a game with, otherwise, a very detailed tutorial.
I really love the idea, and the polish on this game is immense. Genuinely gorgeous, fun, and well-made. This is a really good entry! But it needs some gameplay tweaks I think.