Well, it's a bit jank when sometimes you change gravity to be sideways and you stay "sticking" to the wall, btu I can definitely see the potential for a good puzzle game here. Only thing I'd change is if you will only allow gravity changes on the ground, then make the physics a bit more deterministic, i.e. slow down the player horizontally when falling up/down (or vertically when falling left/right), I feel like the way it's currently done could make some sections annoying, if you want to fall striahg down but overshoot it and fail. This could definitely be also turned into a rage game if you allow graivty changes in mid-air. Cool beans.