I don't know any YouTubers other than "Let's Game It Out".

My fav game to speedrun is Neon Boost (free on Steam) because of several bugs I have found in the game. Otherwise a small boring indie platformer about rocket jumping is made fun (to me) through exploitation of its physics.

1. Diagonal movement is faster (hold two adjacent directional keys). Sliding makes you even faster.
2. Precise rocket jumps can receive more velocity than the developers intended, allowing you to skip many parts.
3. You can touch the end of stage goal post from underneath the platform.
4. You can wall jump off of the top of walls, allowing for many skips and time saves.
5. You can get massive upwards velocity by sliding into a small couple-pixel ridge and jumping precisely once you touch it. This is possible on the starting platforms of all World 1 levels. It basically only improves individual level speedrun records, except on one level where you can skip the whole level and complete it in 1 second (an 9x faster than intended.

My crowning achievement was completing the final level of World 1 (1-12) in 18 seconds. The Devs expected a fastest time around 40 sec.