Great job on your first game.
Starting with a 3d game can be very challenging. There are so many things to think about (like light and volumes). I can see that you got some Portal 2 (and maybe Talos Principle?)influence for this.
Now for my critics that may help you improve:
Music and SFX are crucial aspects of a game and there are so many place where one can find roalty free music. Try checking Open Game Art one day.
The mouse sensitivity can be frustrating some times. Try lowering it a bit.
The puzzles are smart, you nailed it.
I wish best luck on your next endeavours!