The project file is included. I've updated the camera to follow the player, and you can toggle it to also follow the mouse by pressing shift (just once; no need to hold down shift). The camera will reset back to focus and follow the player when you press shift again.

Movement has also improved, you can hold down the space-bar key to make the player run to the position there going.

Try it in the web demo.

Everything is working out great code-wise; now it's time for Art, isometric art. This resource was initially meant to be a character pack for isometric characters, and let's face it, vroid exported 3d models work just fine, but I had the itch to sprite something, so I exported out a template character and reworked the line art in Aseprite, it's coming along, and I will be working on some more templates to add here and preferable more character sprites.

Here is my flat-line pixel art so far; I like the result. Keep posted for more coming soon.