Don't give me too much credit for the game loop haha, if you managed to make your game in a week then you can absolutely make a game about shooting some targets.
My last jam project was very cheap in artstyle and heavy in code, so I wanted to go the opposite way this time. It was all drawn in Aseprite, and it's definitely something you can make too. Mostly posters so simple shapes, stylized text etc.
The most important thing is to set a scope you know you can handle. A game can be very small and simple, but as long as it's fun and polished that's what matters.