I agree, but I also somewhat understand why. I think Angel's situation going from loneliness to what happened with the coworker, family falling apart, and other stuff, didn't help them process Lee's obsession as a regular person would. Maybe feeling somewhat wanted by Lee made their reaction less extreme due to their relationships (or lack thereof).
I do think it was rushed, but for a small game made by a small team, I get why it might have felt that way. I think if you switched the scene where Angel gets the internet, doesn't find the "hole" and then find the shrine, it would have made more sense. The realization that no one cares, followed by seeing that Lee at least likes them (even obsessively), would go better with their lack of reaction.
I also agree that, even though we play as Angel, it's hard to know what they're thinking or feeling at times.
Also, I understand why there was no internet, but if there had been, Angel checking every single day and slowly realizing that no one ever bothered to text or cares about them would have hit harder and made the reaction make more sense. But that's just hypothetical and wouldn't connect with other aspects of the game. Just me ranting on how the game could have been.