I never thought a metroid maker would work out until i played this, this was really really awesome dude. I love how I still have to return with my map pieces making it still a metroid-vania to its core with the back tracking. I would rephrase your summary to "A metroidvania without having to remember locations" because it technically can be interconnected if I make it interconnected. I'm going to show my roommate when he gets home from work, seriously great job! You should really take this idea farther.
And no complaints considering the great quality and amount of time you were given to make this.