I watched the first season of Hi Score Girl, and thought it was pretty fun. Mainly I just liked seeing what old arcade games and consoles would get featured next. =P It’s mostly focused on fighting games though, which were never really my thing. (I appreciate them; I forever suck at them.)
If you’re a classic Sega fan like me, I recommend giving “Sega Hard Girls” a try. Or… I guess it’s called “Hi-sCoool! SeHa Girls” maybe. But it’s a goofy low-budget CG show with very short episodes about Megadrive, Saturn, and Dreamcast reimagined as girls trying to graduate a Sega gaming school. This concept is pretty similar to Hyperdimension Neptunia, so it’s only fitting that they had a crossover game made for them (on the Vita). Saturn, best girl!
A recent animated series released on Netflix is called Glitch Techs, which has strong Saturday morning cartoon vibes. It takes place in a video game city where the most elite gamer kids are trained to battle “glitches” (basically video game enemies). It’s very much a monster of the week formula, and the kids learn lessons like teamwork and being honest etc etc. It’s all pretty harmless fluff, but there are some fun times like the episode where they’re trapped in what is clearly a Castlevania: Symphony of the Night ripoff, complete with ham-fisted opening speech from the vampire lord.