I loved your visual style and concept! It was entretaining, the last step is not clear (spoiler: furnance one) but once you apply the old technique of 'just try everything crossing ur mind' you figure out. x3 Only thing I missed was sound. I downloaded it so I could listen what you did, but you could have made your game way scarier with a different sfx choice, asides as adding some ambient (even a long low note would help).
Amazing job you did here. Keep developing. <3