We can basically work with any 2D art style, as we can render any .png image with our engine. In the end, it depends on how much art you can produce in your style and the type of game we are going to make. Just show some of your work and we can judge it.
I think, though, that a more 'gamey' art style is better for game jam games, as it allows you to produce more assets and polish them more, so you get a cool little gaming experience. I'm thinking, pixel art or cartoon. But other styles could work as well.
, or this: 
(Oof its a little