You definitely captured the Pizza Tower vibes, with the music, art, and level design!
Genuinely think this could be awesome, and go far, if you come back to it after the jam ends.
You've already got a lot of the hard parts of capturing the feeling, I think with some more studying on the level design that you had mentioned you neglected, and tweaking the physics a little bit to fit with the difference in movement between Grem and Peppino (and take advantage of it), you could spin this into your own take that I'm sure Gigi would love to try to play on stream!
Great work!