Cute little game. Short and sweet. I don't know if it was just me but I did notice that the changed gravity wouldn't affect me until I moved, but it's only a minor bug and didn't detract from it.
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Thank you so much for playing and replying! The bug you're experiencing was due to a 'bandaid' fix of mine where, for whatever reason and that is probably my fault, the player character would not climb slopes despite having a rounded collider and using move_and_slide so, instead, the Y velocity (gravity) is set to zero once the player is detected to be on the floor, conflicting with the check for when the player is able to switch gravity.
I suppose in hindsight it may have been better to have just allowed to player to switch gravity mid-air. It wouldn't have been what I had wanted to do but doing that would most likely have no bugs as there evidently are now.