slowbeef is more recently known as a part of the Retsupurae duo (https://youtube.com/user/retsupurae), a channel that I've been following since 2011 and has maintained high quality videos the entire time. (they used to riff on Let's Plays, but now they mostly riff on Flash games/Kickstarters) My personal recommendation is the Negotiator series of riffs: https://youtube.com/playlist?list=PLo4M1tlpv9ruM7k2Pr_0auqL8...
On his personal channel, slowbeef has been streaming ROM hacking as well: https://youtube.com/playlist?list=PL-DNICST8Zbw9ytaMAl66Ghzx...