You have to burn the rope (very short) super press space to win action rpg (short) & soon: Dauntless (ILs - shortish)
or anything on newgrounds.com haha
There are an overwhelming number of free games. Here are some with already established leaderboards:
Any web game is probably free - https://www.speedrun.com/games#platform=Web Tower of Heaven - https://www.speedrun.com/tohvn Within a Deep Forest - https://www.speedrun.com/wadf Maldita Castilla - https://www.speedrun.com/maldita
Plenty more; have fun
Every game I moderate is free of charge, so check 'em out in my profile! I have a ton more recommendations if you want webgames or mobile.
Here's a webgame with a WR not beaten for 3 months: https://www.speedrun.com/Im_Still_Here (~2 minutes) Here's another that hasnt been beaten for 6 months: https://www.speedrun.com/Snow_Line (~12 minutes)