I loved this a lot.
Jingle Beach is such a lovely level idea, really enjoyed the sense of verticality and scale even in a relatively small level. The sound effects and chill music were very very nice. The art style is of course adorable as well. Love that little sprite so much.
My only suggestions would be i-frames when getting hit, and controller support, both of which I assume are planned but I needed to mention. Especially i-frames since I was getting juggled a lot by the enemies.
The movement feels fun and fluid. I'm not used to having a triple jump but I like it as it gives a lot of platforming flexibility.
I am really excited to see the final product, 3D platformers are a ton of work so you should be real proud for releasing the demo!!! Thank you for sharing with us!