Isn't that the robot from the Disney movie The Black Hole?

Artist description is clear that it's Laputa.

Artist said:
例の日に告白
「はいこれ！手作りだけどべべ別にそういうんじゃないから勘違いしないでよね、でもあんたがどうしても勘違いしたいってんならそれでもいいけど……」「そうかすごいな、何言ってんだお前――それより外見てみろ、すごいぞ、ラピュタは本当にあったんだ」

"A confession on that day.
「Take this! It's hand-made b-but it's nothing special so don't misunderstand me, but if you absolutely have to misunderstand me that's okay too...」「Alright that's great, what are you talking about... More importantly look outside, Laputa really does exist!」"

The line "Laputa really does exist!" is a quote from the Laputa film.