Charming game! The puzzle rooms were interesting. Would you consider making the paths more clear (I did not know there were paths until I read it here in the comments) and to avoid overheating so quickly?
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Yes, I got similar feedback from an irl playtester. In the next update, I'll add an introductory text to briefly explain the mechanics (including the doors being in the corners). I'm also changing the heat gauge so that the player starts out with 3 points instead of 2, and I'm altering the gauge filling speed. Thank you for your feedback!