This is a great looking game! Visually, very pleasing to look at, and a very uniform style and feel to it. The falling particles are subtle, but add to the very dark atmosphere. Loved the choice of audio and sound! The growling roars of the eyes was genuinely spooky.
The controls are super tight and easy to use. The platforming feels good and is easy to reason about. And the tutorial at the beginning of the game was straightforward, and easy to understand, and you quickly introduced challenges which involve using them - great design choices there!
This is a very strong foundation of a game - there's so much potential here to work with. Would be cool to see you build upon this game in the future.
All in all, lovely game!