With the obvious exception of this being extremely short this is really cool! What a solid foundation for a game.
Firstly the art is great, I love the character, their animations and the transformation it's all really well done and fluid! The environment tilesets are really solid and well done too. A little more variety would have been nice.
The audio was fine and SFX matched really well.
The character movement is SUPER solid and well done, I like that there are different abilities between soul states. Could be a really cool metroidvania mechanic to have soul state specific abilities or something in the future.
The story being told is quite interesting, I'm looking forward to seeing how it explored in the future if you continue to develop the game.
This was really fun, I hope you do more :)