As Davy said no one will make your game for you
But some of us did parts from which you can build upon
When you launch my example you should be in build mode
If not keep pressing middle mouse button
That is kinda level editor with player
You most likely just want 2 modes
One when you build but you don’t have player
And one when you can’t build but have player
On my itch you have whole project zipped you can download and open yourself
From that you can build fully functional level editor
I mean learn how to build one