The Haunted Forest

This is a good start so far. You did good having the first cube near the start point as that helps the player know what to look for. Try to use as little premade assets as possible, you don't need high end graphics for a good game. Sounds even a simple ambient scary music can make everything in a game just to break the silence. You seem to have invisible colliders around the edge of the map and this is good, no dead zone for us :)

With programming if you use C# make use of the start() function. The mouse was invisible when I died and I couldn't see it in the menu. Whatever the defaults are for your game you should confirm it in the start function (what is hidden, what is active like the cubes...etc). Sometimes Unity remembers if you have hidden something or changed something so when you play the game again it does not reset everything the way it was. Setting them in the start function guarantees this so for the mouse on your main menu script make it visible in the start function and hidden in the game itself.

I think for this game, you will need a path or landmarks. I only found one cube. The map seems to be huge as it took almost a minute to load so less could give you more. Add hills too. People can struggle with games so if people do not follow a path to each cube or you want to keep it as a hunt, put them in landmark areas so it helps us know where we have been. Maybe some lights over important areas too.

I am a fan of Slenderman games. I have a few games on my channel here and on my YouTube so if you need an idea of what I mean feel free to take a look. My 5000 nightmares game has lots of people playing it online so maybe that will help.

Anyway I hope that helps, I look forward to what else you build, good luck and never give up :)

I am always excited to try first time developers games, it will set you for how much passion you have for games development for the rest of your life (no pressure) :P