Wow!! This was super good. I could really see the Ib inspiration in the puzzle design and sounds effects, but I like that you didn't just copy your influences. You really worked hard to take those things that inspired you and made something of your own. I loved the characters and love the concept as well.
Couple of small things that ticked my rating down. Both are super pedantic, but important I feel. Firstly, the text boxes were really weird. The actual design itself was awesome, but the text itself was too high and too small to really fit into it. I'd suggest bumping the text down a couple of pixels so it doesn't overlap with the border, and either make the text bigger or the text box a little more squat, just so the text fits in better. Second, the boss fight was certainly not the worst I've seen in an explorer horror, but because you only have the one window of opportunity to attack, it takes a very long time to finish. Probably a little too long. Maybe you could include either more windows to attack, like at the end of the big run attack, or balance it out so that the attack that does open a window shows up more frequently. My winning attempt I think took about ten minutes, which is pretty long!
Finally, let me just say that for your first ever game, this is highly impressive!! Like holy hell I haven't even mentioned how good the art direction and music was. Like damn, this is awesome! Definitely going to be following you, and looking forward to what you make next!