this is a really original and excelent idea for a video game. nice work!
u all should take this oportunity to develop a real long game. u can also make a decision game: in some parts u have more objects than paints and u can use more than one for they all and, depending of the object (or object combination) u can create a different paint and it makes u go for different way to resolve the history and u can put more paints.
in that case, ull have to solve the game many times until u get all the paints (100%).
u can make optional paints too.
its a really excelent idea. please, dont stop it and make an excelent game.
take care. see u. :D