Gravity mechanics are a win, especially when I stopped using the mouse to attack. Lean into that, especially with puzzle solving and you have your main gimmick locked down. I understand what you were trying to do with the two dimensions/two art styles but as it stands right now, it feels like two parts of the game were made in silos and then sort of taped together after. I don't think you have to get rid of that concept entirely but, you need to solve the puzzle of how to make them feel cohesive otherwise it just looks sort of lazy. Great start!