The current routes are Malik, Chris, and Nate/Jake (as a pair). There's a fourth secret route technically in the game but that may not be obtainable yet.
In general, if you want to help test right now (thank you!), it'd mostly be useful to find obvious errors (sprites missing faces, missing clothing, actual game crashes and errors, typos in text).
The actual obtainability of things (and how routes and actions link together) may be changing as new scenes and routes are added, so I'm not concerned about them at this point in time... that's really what the beta will be for testing. (For example, if you can't obtain the end-game bonus for maxing out James' friendship currently, that's fine, because more scenes in the future may let you do so.)