Really enjoyed this - it's about time somebody decided to make some new stuff with Clock Tower-style gameplay. It plays really nicely. The voice acting is also great, and the art style is unique and pretty. The whole thing is designed very well; I didn't encounter any bugs or anything. It feels very polished.
I thought of a couple of small suggestions to make the gameplay just a tiny bit smoother, if you're interested. Nothing major. It would be nice if you could still double-click to run even when the cursor is blue and you're on your way to investigate an object/open a door. Then, if you have an item selected (like a key), it would help a little if it would still turn blue when you hover it over anything you can interact with, just like the cursor does when no item is selected (so you can tell if, for example, you're holding the key in the right spot to use it on the door). Also, being able to right-click to skip lines of dialogue would be convenient, particularly if someone is replaying the game.
I'm really glad to see this is only "Night One", and that there will be more coming in the future. I'd like to see more of the mansion, and a wider variety of items to find and places to hide (with more optional cutscenes and puzzles and such). This project seems on its way to becoming something very cool, and I can't wait to see more!