Good job making anything! The first few steps are always the hardest. Next time you do a big open world thing like this, make sure there's a collider somewhere under the floor that kills the player if they clip underground (think Minecraft's void), and/or make sure there's a reset button in case the player gets stuck. Also, anything 3D is going to be harder, I'd recommend focussing on 2D games for now, there's a lot to learn about game dev!
Metagame cog 77/126 (Did you add the code to trigger the cog? I didn't seem to get one, despite getting the hat and winning - unless there's something I missed?)