Thank you for taking time to write a detailed review! A lot of other people have pointed out the same issues and we should have made it more obvious as to what needs to be done ie. environmental clues, more player feedback etc. However a simple sound effect is all we had time for to indicate that the alien broke the door to outgrow the ship. It just so happens that it also reaches you when it breaks the door so the player should figure out that it needs to electrocute the alien as soon as that happens.