('3D guy' answering here) - I'm glad you liked both the game and the art, and that you gave him a chance despite being really slow at the begginning ! :D
Yes as my friend said it was all on blender and not painted on top of it, I was sad at the beginning but I got surprised by the result and happy for finding this 'style' in the end. UVs and Texturing were kinda rushed because this workflow doesn't need to think about texture weight or exporting as 3d object, Texturing was made with the free layer add-on Ucupaint, I used some pbr to work faster and draw on top of it with a tablet. Did the animation with fast & simple/custom rigs, used the free add-on stop mo to have a fast preview of the step I needed for the 2D/drawing style, then ajusted the step in the render setting, and exported as multiple frame. For the rendering, yes I used perhaps 5/6 different camera (in orthographic view) depending the items and angle (same for grease pencil), this number gave a better control and non destructive workflow.
Aseprite was used just for trimming, fast quality check and exporting quickly as spritesheet.
Hope it will give you all the information you needed :p ! Thanks again