Actually, it's not the openness of unity that causes me problems. I had liked that. The problem was rather the opposite, that I had the feeling that they were trying to force the easy way on me. I'm sure if you know how, unity's collision detect system is better than game maker's but I hadn't found any tutorials showing me how. I watched tutorials for 3 days but they all used inflexible methods.
The system is just completely different
and figuring it out myself would have taken months.
Regarding the sprites and music I hadn't given a clear answer because I can't evaluate it yet.
It's the same with 3d models. I want to try to make some for Bobo 2 but I would only need help with it if it turns out that I will not be able to achieve the results that I need.
This year I probably won't need any help. I would definitely find something in the long run that you can contribute but it would also have to fit my game in terms of style so that it blends seamlessly.
Since the upcoming games are going further and further towards full HD, it wouldn't be pixel art anymore. Would you be able to do that?
With creating rooms I meant designing levels and with decorating I meant beautifying the rooms by placing tiles and vegetation objects.
Unfortunately, the only methods I can think of would be to either send the project back and forth or replace existing rooms with new ones. Both variations are dangerous because they can corrupt the project in the long run and Game Maker has a tendency to corrupt projects anyway.
But it would be nice to see/hear some of your art to be able to keep you in the back of my head.