This was made by Carrot Games' chief capsule artist, Kali (you can find her on instagram @Kalisdr_art)! She's worked art for other games and I've been told commissions are open!
For those who don't know, the "capsule" is what steam calls the graphical pictures that appear attached to a game in the shop, the library and other various places. Other storefronts like itch have a similar concept, and it's the closest thing to the "box art" for digital releases.
Even though the game is pixel art, the laws of the biz demand games use illustrations for this kind of promotional material, and not in-game art. This has been a thing since the old days, and I guess it's become part of the public subconscious by now. But I think it's a great opportunity for a small studio like ours to display the game characters in more detail! I personally love the beautifully unique style we ended up with in this one!