I really enjoyed playing this! I'm a huge Souls/Borne fan.
The flying mechanic is really good and interesting, great use for it. My only issue with it is when you exit out of the state it stops the player's Z movement if you pressing W or S while exiting the state, maybe this is intentional? Projectiles are good, particle effects need to be a tad slower it's hard to look at.
Other than that wow color me impressed. I had a lot of fun. Boss fights were awesome, especially Hyper Fairy. That was sure hype lol