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You really nailed the theme-- and built a compelling game function out of it! well done.  That said, I think the process of transferring heat takes too long, requires too much repeitition.  With some tuning you could have a really great game here!

Some repetitions are intended as a solution (e.g. the first stage).If you were bored that is my bad level design.Indeed I excluded this stage because it takes too long time.