Congratulation on making your first game! 🎉
I really like the parallax effect, but unfortunately didn't enjoy the game that much, enemies weren't really a threat or had any attack patterns other than "run into player", I'd suggest looking into games like "hollow knight" for good enemy designs. Good job on getting the basics of platforming and getting the elevators to work, but this game still definitely needs more time to cook.
I have more to say but I'll leave it at that.