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The art is great, but that platforming needs some woooork. Not bad for your second game ever though!

Try these fixes:

For your character, check out this character controller to fix your velocity issues:
https://github.com/Brackeys/2D-Character-Controller

And to fix the wall sticking, add a slippery physics material to your characters RigidBody2D:
https://docs.unity3d.com/Manual/class-PhysicMaterial.html