Level designing for Black hole game

I’m building a “Black hole”-genre game in Unity and already have every 3D model, texture, material, and helper script prepared. Your job is to turn those assets into workable prefabs and then lay them out into 25 complete, playable levels. I already have 20 levels in place, I need 25 more. Lighting and camera are already setup.

Here’s the flow:
• First, create tidy, reusable prefabs from the supplied meshes.
• Then, using my alignment utility script (it snaps objects into towers, circles, spirals and other patterns), drag-and-drop those prefabs into fresh scenes that feel polished and engaging.
• There will be some unique obstacle/mechanics like bridge, gate etc which also need to be placed.
• Test those levels on your Android mobile and verify everything is working.

I will provide a reference game videos which can be used to design such levels. It won't be the exact game but similar.

Flat-fee budget: 5000 INR