Hello, developer! I'm new to your project, I don't know much about it much but when I come across your demo game in this store, I was immediately press the game to see the details right away! Everythings looks wholesome: The character's abilities, the areas, animations,..
But one thing that disappointed me HUGELY is the Black blob's design. I know you might have your whole ideas and backstory and script of the Black Blob, but I think the game would look way more unique if the Black blob is its own creature, not something humanoid. It looks just lame as any horror try-to-be-creepy humanoid monsters in those lame horror games. You can look at Hollow Knight, Ori and the Blind Forest, the Rain World,... those main creatures really stands out!
I look at the example gameplay Black Blob's characteristic and honestly I feel it of a Blob more of a humanoid, it can move fast in Blob form just fine, maybe you can inspire from Venom in Marvel, they seem alike! Over all, I really like your game's first expression, one thing I really wish to change and took time to write all this is the Black Blob design, but again the entire final production is up to you! ^^
I hope you take this as a very very very small opinion of mine. I know this is a year ago but just in case you're still developing!