Why is Sun so sassy and critical of you during Arts and Crafts when in Security Breach he was kind and over-enthusiastic? Because you're not a kid this time, you're an adult, and a staff technician at that! Sun knows you're just here to do maintenance, so he has less patience than he normally would for you screwing up instructions.
That's probably also why he immediately shreds whatever you make even while complimenting it, it's just part of the maintenance protocol.
He's also trapped in the abandoned pizzaplex, where few if any of the lighters are still on. Sun is so impatient because he's hanging onto sanity and self control by a thread while you... color. Even if he isn't bothered by how little concern for his own well being you're showing Sun is aware that at basically any moment the lightbulb keeping him sane could burn out at which point Moon will probably kill you and you're unable to even recognize the danger being stuck in VR. Well until you get the mask off at which point you are just bothering him for no apparent reason while he tries not to murder you.
To get the standard ending you collect six Fazforce action figures, while the golden ending has you collect crude dolls with handmade character masks. The action figures represent Fazbear's as a soulless marketing machine who put profit above all else, and leads you to becoming a STAFF bot. The handmade dolls represent the children who have been hurt by Fazbear's and William Afton, and it leads to Vanny destroying the remains of the Glitchtrap virus once and for all.
Fridge Horror
The Fazforce figures call back to older mecha anime series such as Voltron, with them even being able to combine into one mech in the cartoon. In those series, there was usually a human inside the mech piloting it. Sometimes even a child...
To add another layer to this, the Fazforce mechs seem to have their own personality (like Transformers). A human child, stuck in a robot with its own programing that they can't always control...
The first-aid minigames may be darkly humorous, but they imply rather dark things about how children get treated at the Pizzaplex. Helpy gets beaten with a hammer, has his leg sawed off, sprayed with cleaner in the eyes, covered by a scream-stopping mask, and stuffed with pills. He's an animatronic, so he's alright; but he's not the one the actual medical staff would be treating on a day-to-day basis.
