From what I've read the opposite can also happen: people can see the price of something and think it's not worth playing because it's cheap. Better to sell something higher and then put it on sale. It's a weird psychological thing that our society does. You'll definitely want to strike a balance though.
Maybe you can do pay what you want with a minimum rate? I also think your ideas for packages was good too. I'd personally *love* to have a behind the scenes artbook pdf to scroll through or something along those lines that I could buy for an extra fee. You could also sell the custom soundtrack on itch.io or bandcamp and split the profits with the musician.