One way to do this, as I just suggested in a new thread, would be to allow keys to access specific files, filetypes, or files with specific options (like "Access Hidden Files"). Then you could categorize your keys and only give access to certain parts of a project, ie file 1 for low-tier backers, file 2 for mid-tier backers, file 3 for gold-tier backers, etc.
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Yeah that could work for certain projects, but for me there will be only one build of my game. Since my game is online only, players will get their reward/rewards attached to their account which i guess they will have to redeem by submitting their purchase key from this site, or from patreon. But would be nice if i could stick to one system then i'd only have to deal with one API etc. Still trying to figure if what i want to do is possible.