3D Math logic game

Hi , I need to develop a simple 3D game about math logic, with Venn diagrams. The graphic style I would like is like the attached image, low poly. It is a non-commercial project. It was posted before but mostly proposals were for 2D. It is about a character who needs to gather fishes in the sea for an aquarium, it will fill the tanks depending of the captured fishes with restrictions in each tank, using the Venn diagram concepts I need the players to understand. A guide for the logic operations is this App(again, those are the operations, not what I need the game to look like, aesthetically talking): [login to view URL] The scenarios would be 3, the aquarium from the outside in the island, the inside of the aquarium with the broken tanks, and the sea.(the island is what it might look, not a good sketch but I think it works for understanding the overall) There would be 2 characters, the assistant, who is repairing and doing other activities in the aquarium, and the main character, who is the caretaker of the aquarium and responsible of getting back the fishes.(sample of main character, would be like the scuba diver in the attached image) We also thought about the mechanics of catching the fish in the sea, it would be like Wii Shutter pup ([login to view URL]), but using a net and moving the pointer with the mouse, when marker goes red (fish pointed)and click made, then the fish is catched and put in an inventory, classified by color or type of fish, maybe the type is just a different texture, like stripped or with dots, something like that (again, going with the Venn diagram concepts they'll be used for). We have a basic Game Design Document without mechanics, just the ones I mentioned. Also I would like an intro cinematic about a volcano erupting and damaging the aquarium, that's the reason why the character has to get them again, because the tanks got broken and the fish escaped, maybe 20 sec or less. Mainly cinematic would be dialogues, the only part really animated is the volcano erupting and damaging the aquarium I would like this level only first, the Venn diagrams level. Depending of the success with the students, we would need more levels, but I'm going to test it first with some of them. I also need the Unity project with assets and used elements in the game, and of course the installer. We can discuss everything before starting, I would like to know how much it costs, how much time you might need, and any proposal about the mechanics would be nice(thinking that filling the fish tanks would be using Venn diagrams logic). Many thanks in advance.