Crocodii has a point here, colour palettes for the background and showcased thing should never be the same, you can however use a more pastel version of red and green meaning you’d just make it lighter but i’m sure you can come up with something better.

As another pointer you should work on your stickfigure design and creation skills before submitting anything, you may not be submitting anything at the moment but if you consider it just think about how much better your stickfigures would do if they were higher quality.