It's actually quite good for an early attempt. Good bold and consistent art - I like the shadows cast by some objects. Decent overall polish. I bet if you could add just a tiny bit more depth to the gameplay you could be creating some fun platformers.
By the way, personally, if you want to start creating more complex games, I cannot recommend Godot enough. You'll need to learn some programming in order to start creating more complex stuff, but it's really not hard and the engine is very beginner friendly.