There's definitely some parts of an interesting concept here and when you figure the controls out a bit it's got a nice bit of gameplay with the different tools given to you. I've gotta say though the controls just really make it hard to get to that point.
Using WASD/Arrow Keys for the movement and then the arrow keys for the movement of the POGO combined with the fact that jump was Z and the pogo was X, just lead to a lot of weird movments trying to keep track of what I should be hitting throughout.
When I actually did though the pogo definitely had some interesting uses with the fact that you could not move and had to lose it to do anything. Which lead to a lot of, I guess "yoshi jump" esque situations. Where you ditch yoshi in a mario game and jump to a ledge. Could be interesting if that had repercussions in sort of the same way it does in mario. Where with it Yoshi he takes a hit for you etc.. Maybe something where you can lose the pogo mid air could be an interesting mechanic.
Overall though, the design in play is actually quite interesting, I just wish it had a bit better ability for me to experience that design with slightly better controls. Space for jump, Q for pogo stuff like that.