Hello Simon,
yes, good idea, here there are some links to some level designs:





The levels are a combination of open backgrounds, original graphics and textured foregrounds. If you want to know more about them I suggest reading the credits in the assets repository.
I attached another recent one that is not above. Please be aware that many levels are being redesigned so they may change in the future.
Please also be aware that the resolution of the provided links is reduced to make the files smaller, if you want to use any of the graphics I suggest to go directly to the source in the repository.
If you use any of the assets please use the credits I attached to this post.
Thank you!