(Sorry that this is long and/or messy!)
I think it's fine if a character already has been shown to be hyper-sized, but I also think it's confusing at times as well. As I've played the game, it's been very difficult for me to get a sense of scale of all of the different characters (especially in relation to other characters). I feel like some of the best examples of this are characters like Ran, Jar, and Iron.
Jar is mentioned in his dialogue that he is much shorter than the player character, yet in some of his artwork, the player character is shown as smaller than his cock and balls. This confused me because while Jar does have very big assets, the fact that he is smaller than the player character height-wise doesn't add up with the artwork in my opinion.
I don't remember if Ran's height in relation to the player was ever mentioned, but there was a big disconnect for me between his character sprite and his sex scene artwork. A piece of art that comes to mind is Ran seemingly towering over the player character, who is hugging Ran's balls with his full body. This would only make sense if Ran was actually that tall, which wouldn't make sense either because then most of the town would be roughly the same height and it would be very hard for the player character to interact at all with any of the characters. Or any of the environment, considering it would have to be the same size to accommodate their height.
Finally, Iron is one of the few characters who I do have a sense of scale with due to his fight. The player character can grapple Iron's full body, so Iron doesn't seem to be hugely taller than him. One of his game over art seems to be pretty consistent in the scale, however the other one only shows Iron's genitals so it's hard to gauge the scale from that art. I know that the current artwork is temporary, though, so I hope that character scale will be more consistent with future artwork from CM.
Character size (height and genital size) is the only major criticism I can think of. I think it would benefit the game if it was more consistent. I do like all of the hyper artwork, but I'd rather have proportions between characters make more sense. I feel it would draw out the hyper aspect more for the characters that are hyper, as it would be easier for me to compare hyper characters with non-hyper characters, furthering the size difference aspect.
Overall, I really like this game and I see a lot of potential! Definitely one of my favorite visual novels so far.