Personally, I think this is an almost flawless entry. I love the art style. The player looks like Bobby Hill which is hilarious to me. The music sounds great. Movement mechanics didn't throw me off. They felt pretty natural to me. And its a cute and fun idea for a metroidvania. That said, the things that stick out are:
- Player Controls - Arrow Keys with Z and X does not feel natural to me at all. Since you're using Godot, its really easy to set up alternate controls and gamepads. Unless my game requires the mouse, I always add in gamepad controls since Godot makes it so easy.
- No Map - Because your world is so well designed and requires backtracking, it would be helpful to keep track of where I am and where I've been.
Overall, I can see this game being in the top 5, no doubt. Congrats to you all!