I really like doing Roblox speedruns (even if I have never recorded one) but I also want to look for some Roblox games that I can try and speedrun in the future when I end up getting a YouTube channel. Thanks!

adventure forward 2 and robot 64 are great games and good speedgames, probably not the absolute best for starters

Something short and simple could maybe be Down Hill Smash or a Beast% in Flee the Facility

I 100% recommend Climb 2000 stairs to VIP as a starting game to speedrun. It was my first Roblox game that I speedrunned. It has some short and long categories that are easy or hard depending on what strategies you do.