I found this game to be more similar to a souls-like rather than a metroidvania. I think that the environment design was pleasant, but there were aspects of the game that were frustrating to me as a player: The lack of wind-up animation on the bad guys made them difficult to fight, so I opted to run past them. The camera was shaky, which made it difficult to roll in a straight line while climbing the spiral incline. I unlocked the green character with the gun, but he would not shoot the big purple balloon, nor the bad guys.
A game like this is very difficult to make within a short window, so I think given the time restraints this is actually a very impressive project. I hope that you iterate on the combat and lean into the souls-like elements in future versions of this game.