Yargis - Space Melee allows you and your friends to create levels and game types and upload them into the Steam Workshop. It only takes 2 clicks, and your level will be shared with millions of Steam users!
- You can load your own images
- Easily play with others, levels are automatically downloaded
- Colorize your walls and 3D items
- Play your custom levels over the internet
http://store.steampowered.com/app/369040/