Considering the solo development and the time, you did a great job here. Had a lot of fun delivering desserts across dimensions, that I should say, I liked how smooth the transition between both dimensions is. The simple mechanics help to grasp the game in no time.
Now for my observations: Nothing that harms the player experience, although I felt the character speed a bit slow and some SFX were missing in the 3D world. There was also a 2D object in the 3D world (the stove clock), idk if it was on purpose so I'll just point it out.
As a suggestion for the future, for an "endless" run, you could use a strike system and a faster pace. Also, switching the UI from 2D to 3D when dimensions change could be a nice touch, although not needed.