Wow, feels really polished.
Mechanics are very intuitive. Monster looks cool.
You managed to create tension really well.
Though personally feels bit frustrating to loose, especially like round 6, as it takes relatively long time to complete a level . Loses feeling bit random adds to the frustration. So ig communicating behavior of the cobb like smell, vision and hearing could have been beneficial maybe? But then it would loose some tension so idk. Maybe also reducing the size of fully dark areas in level 6 could be cool as feels bit too punishing.
Overall i really liked it, and i just can't wrap my head around how you did it in such a short time.
Also conveyor belt is an amazing idea, makes game much less tedious, feels good when coals gets to a destination and can create some memorable moments