This ... is a spicy meatball!
I've played 30+ games, but hadn't tried this jam submission yet. Every time I'd see the thumbnail and name I knew I wanted to give the simple, charming looking platformer a go. Especially as a former pizza boy myself!
Man, oh, man! Did you deliver an excellent jam game. Let's put aside levels 4 and 5, which were .. wow! The background layers on level 4 were genius and somehow a nostalgia hit for something I'd just done! And level 5 was a loving tribute.
Even if you take away those extra touches though, you made a platformer that feels great to play (love the little buffer coyote time for forgiving jumps, the animations and particle effects gave everything life, the immediate respawn and generous checkpoints were much appreciated) but not only did it control great, it had awesome level design. The pacing was never boring and even though the coins are probably ultimately meaningless (unless they're what triggered level 4 and 5 and I didn't realize) they were a joy to collect, because they weren't too far off path and were enjoyable small platforming challenges. And those SFX and music! I think you wrote you used other sources and an asset pack, but even still, to select and implement just the right sounds is a challenge in itself.
My only critique ... other than wanting more levels, but let's be real, this is an ideal jam game length, is that I prefer when secret areas with additional coins are somewhat hidden. Telegraph to the player sure, so it's not completely obscure, but there's joy in discovering those Mario walls and Ori spaces you can actually jump into. How you do that with a retro palette and small pixel canvas? I'm not sure. Maybe a slight variation on tiles you can actually pass through? Only other thing, and I may have just missed it, is I would have liked to have the reveal teased a little earlier. The first time I noticed something amiss was right before delivering to the house in level 3.
Overall, awesome work and a joy to play! With three diversifiers!!