Impressive how polished and complete this is. I love how much is interactable/slashable in the background. Good sound design and visuals, overall solid controls and camera, feels like playing a proper game. I agree with the other commenter that while the game systems (like alchemy, inventory, etc.) are cool, it is a bit of an information overload. Ideally it's spaced out a bit more over the first section of the game.
Some minor nitpicks: Looking up/down could be a little faster, the delay feels a bit too long. Jump feels a little weird too because of a slight delay, I have to hold the spacebar for longer than I expect and keep accidentally making just a little hop. Though I can see how holding the spacebar longer makes for a longer/higher jump, but I naturally expect a regular press to give me a regular jump.
Unity tip: you could consider using Platform Effector 2D on platforms, which makes it so that when you jump into a platform from below, you can pass through it (and don't annoyingly bounce into the 'ceiling'). Unless of course you specifically want to limit the player's ability to jump in places.