Welcome to MaGMML1R-net!
Make a Good Mega Man Level Remastered is a remake of the original Make a Good Mega Man Level released in 2016, a compilation of 20 community-created levels. You can find a more detailed description on the MaGMML wiki or on the release thread for the game.
This website hosts the leaderboards for the best times on each level in MaGMML1R, which you can access in-game as well. Click on any link on the left.