Took me a few minutes to figure out that none of my keys did anything, and I needed to tilt the camera down.
Got to the sewer level, flicked the lever, and gave up eventually. I don't think the wind particle effects that the lever summoned helped
I think I would like this game a lot better if the camera was looking down, so that the camera and pogo stick were parallel, not perpendicular. Maybe thats just because I'm used to source rocket jumping pogo, but I think it feels a lot more precise, and maybe easier to go from a pogo that pushes you fowards to wall-pogo.
That does make it harder to see, so maybe have 2 viewports: a camera looking down on the pogostick, and a fixed Mario-3D world camera for the environment. Obviously the levels would have to be reworked for a secondary fixed camera.
Since there is NOTHING you can do while mid-air, maybe add some arrows and stuff to look at that indicate precise velocity, and pogo stick angle (but the pogo stick angle indicator wouldn't be needed if you had that down facing camera)