I appreciate the amount of detail in this feedback.
There's definitely still lots to work on when it comes to balancing the fights, especially when it comes to the op melee attack. And funny enough, we had plans to use certain things you mentioned such as the conveyor belts in fights, but the time crunch hit us pretty suddenly. Also the little coins are supposed to heal you, so I understand why you were confused after seeing them in the beginning area with no bosses or ways to lose hp. There's still lots to explore and work on, but either way I'm glad you enjoyed the game! Thank you!