Hurrr durrr Godot can't make 3D games, hahahah! Beautiful game, I'm happy we've got our share of 3D games in this game jam. I really like your post processing effects, the level transitions and the effects when getting a diamond looked really good. Your glass shader is also really interesting with a blur effect and some nice level of specular reflection too, great job! I'm not sure about the square particle effects, they looked way more stylized than the rest of the game, but since they were everywhere I'm assuming it was a deliberate stylistic decision. Music and voice overs were really good,
About the rest of the game I would say you did a great job overall, usually those physics based controls can get frustrating pretty quick but you nailed the level design to not make it so. I didn't had many problems, once I stepped into the wind/antigravity thing that was under a piston and it killed me by just touching the piston above even though I wasn't being squished by it, thought it was unintuitive. There was also a point where the carried boxes got stuck on the level and the delivery building wouldn't register them, I think I suicided to make them reappear floating above me again. The restart button doesn't actually restart the level though, it just respawns you back to the last checkpoint, I wanted to respawn back at the beginning at some point. Oh, and the saving system behaves weirdly, it kept deleting the progress of some levels, each time I re-completed a level it would forget a different one, not sure what was going on there. But these gripes are mostly a polish thing, the one thing we don't have time for in a game jam, the game concept itself didn't had many problems that I could think of. Good job!