Kentaro Miura is the illustrator for the cover and sci-fi pictures.

There are also other artists. Most are under pseudonyms.
Miura's pseudonym is written in reverse with Japanese characters.
Akahori Satoroichi-sama あかほり さとろ一様 (Title)
Urotanke Raumi-sama うろたんけ らうみ様 = Kentarou Miura (p 5, 6-7, 15, 16-17)
Moriko~sama もりこ〜様 = Mori Kouji (13-14)
Odachin おだちん (26-30)
Akkiu あっきう (8-12, 23-25)
Yumemi Sugiko 夢美 寿祇子 (18-22)

Scanned by Twitter @FrostiFusionZ_
Source: https://twitter.com/FrostiFusionZ_/status/1740582429734400056

That's really cool! Thanks for sharing <3

Do you know if Miura published more art as "Urotanke Raumi-sama うろたんけ らうみ様 "? I couldn't find anything aside from this doujin

Base +6

@Kasuji
This is the only one that has been documented.

Base +5