I always do my jams solo, and I'm first and foremost a programmer. My games' graphics are simple and I tend to focus on mechanics.
What I love about game jams is that I get to see a totally different side to the game making process with games like this. Of course there are mechanics, but the visuals, sounds, and world are all charming and creative in a way that my games never are.
Keep doing what you're doing, this is good stuff!