Henry is the real creator of Bendy! Listen to the audio recording in Chapter Three's ink saturated room, and you get to hear Henry complain about how Joey does nothing but dream, then ends it claiming that he has an idea that will help the studio.
However, her jumpscare may be a desperate shout of frustration as she recorded the song, not Alison, and she was Alice, in a "how dare you take this away from me, Joey" sort of way. Susie-Alice's interjection might be less of a case of "I'm Alice Angel!", and more a case of " I'm Alice Angel!", establishing that she is Alice, and not the person singing! However, remember that Susie was replaced as Alice's voice actress before any lines could be recorded, and as such any recorded audio lines found of Alice are likely performed by the replacement VA, Alison. It seems to be pre-recorded, and the audio logs in the chapter indicate that Susie is the woman who has 'become' Alice. Why exactly is Alice so angry during their jumpscare in Chapter 3, then mostly calm (if unhinged) with Henry for most of the rest of the chapter? The room you're in might have something to do with it, or more precisely, the song that's playing in it.Maybe it's just that things aren't how they seem to be. We don't even know Alice's mannerisms in the cartoon, but she's insane and callous towards Henry and Boris. Another theory is that Boris is supposed to be Bendy's Sitcom Arch-Nemesis: if Bendy hates Henry's guts, then Boris has to be nice with Henry.If Boris is supposed to be a Jerkass in the cartoon, of course he's going to be nice to Henry. Another possibility is the Ink Machine warps the toons into their own antithesis: Bendy ceases to be a cute demon to chase Henry around the studio and Alice - an angel, mind you - becomes so Axe-Crazy she dismembers many toons to remain "beautiful".While he appears indifferent about the lunch belonging to Bendy, he thinks The Snack Is More Interesting. That's because in the cartoon linked to the trailer, the most malicious thing he does is take Bendy's lunch. Compared to Bendy in his many forms, Boris is quite friendly to Henry.