It's simply a remake of the A.L.I.V.E engine, but I'm aiming to avoid putting Oddworld specific stuff in the actual code; Sligs and other objects double as actual dll files you can use in your level, as well as being examples of how to make the objects.
Things like chanting and bird portals will be handled by broadcasting to an AI handler in the objects (if there is one), possession will simply be the object telling the game to switch the ID of what object is handling input. Bird portals probably by getting the nearest bird portal object, and checking if it's reachable and stuff. Remember: these are specific to the object's interface; so each object needs a nice name in order for the engine to know what you're looking for (similar to getElementsByClassName in javascript).
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