This is a great demo. I think you’ve done a brilliant job. It’s really got a lot of personality and charm already and all the basic essentials for a good 3D-platformer are already in there; a cute mascot, collectables, great level design and little things like a jump shadow! The 2D sprite in a 3D world really works for your game.
I almost exclusively play 3D platformers (well into the hundreds now!) and this (as well as having it’s own distinctive voice) gives me Crash (nice gem collectable sounds), Abe (big signs and machinery) and an overall Cartoon Network vibes.
My advice would be to lean into the secrets and NPCs more when you develop it further - really liked the x-Ray/lab room in the timber factory but wanted to see even more secret areas/things etc and obviously NPCs just give the whole world a lived in feel. In terms of movement - I found the green sludge in the timber factory hard to manoeuvre around, I wasn’t exactly sure what I was supposed to do. I ended up sort of spamming the jump button and wall jumping etc. It didn’t feel intuitive enough. I also thought the side scrolling section in the Moving Mountains level highlighted the sluggishness of the jump/wall jump a bit? Maybe add more idle animations when standing still? Minor things, barely noticeable but just my two cents!
Anyway, a really great experience with a lot of polish and I can tell you’ve put a lot of work and love into it - it really shows! Make the full game and I’m definitely excited to buy it! This is special! I didn’t want the demo to end.