May not be the first to notice, but looking back at God's dialogue in that chapter, I noticed something a bit interesting.
First, he says "Silence." "I am taking them back.". He says this in quotations, with no dialogue bubbles present. When HE says "Huh?", it's in the same manner. When HE says God's name, it's in a dialogue bubble, but slightly altered, in a manner that depicts his horror, which makes me think that God was in HE's mind and they were speaking with telepathy initially. But when God is saying "Your power. Your life. They are both forfeit." it lacks both quotations and a dialogue bubble, which could imply he's speaking to HE in a different manner.
Additionally, when God speaks via an illusion of Blast, it's in normal dialogue bubbles. When God speaks to Saitama and the others in his realm, it uses uses dialogue bubbles as well, but different from all the others in the series, with slightly foggy/cloudy edges. When Blast appears, God's dialogue bubble when speaking to him is notably different, with a lot of lines on the edges. (Honestly part of me theorized that it wasn't God speaking to him by then, but that feels a little too far out there, especially for OPM which is usually pretty simple about these things)
Idk what to make of all this, but the way God's dialogue is showed in such different manners in multiple different appearances at least feels like it's supposed to be meant for something. A lot of mangaka's use dialogue boxes as a way to convey, imply, or foreshadow things. Even in Dragon Ball, dialogue boxes for villains are usually more blocky and rigid, whereas dialogue boxes for non-villains are smooth and circular. Could be just overthinking it, in fact I probably am, but it's worth a thought.