Feel free to check out our game Rewind runner. It has online scoreboard and encourages people to use rewind to achieve competive run through times .
I'd really like to receive any type of critiscism of what could be improved, and how your experience was with the game. Rating it is appreciated but not mandatory, I hope you can have as much fun playing the game as we did creating the game.
https://pilkas.itch.io/rewind-runner
Feel free to post your games in the comments if you tried to create a platformer or something close to our game, would love to check out some of the other games who created something close to ours :).