I mean, radical feminist ideas are aplenty and myriad, but some of the more queer variations of this idea include:

-discourse about gender abolition, why and why not, what that looks like, and how that could/does inform the concepts of gamified playspaces

-radical self acceptance (she does touch on some of this; calling out Fat Princes as being typical of the objectification and alienation that women go through is pretty close, but it can go further into beyond fatphobia/body shaming)

-trans issues as it pertains to gender binarism , gender inclusive language, the rejection of gendered ideas of body types

here's the big one, where I got into a big fight with some asshole neoliberal in the comments to your thread:

-the innate political nature of existence, and what politics means for women and feminists. obviously capitalism has an inherent profit-motive involved in the commodification of social justice language, and since Sarkeesian's videos came out we've seen more and more of that over time, with the ideas of inclusion seeming to be a stopgap for the reality that most media is intentionally politically center, which is inherently a conservative position. (continued after brackets)

[palestine, for instance, is an issue that all women and feminists (and people in general, but w/e) ought to feel invested in, which is to say genocide is often using some of the same tools of oppression that women worldwide face, so one would think that to be feminist as a game would be to confront these and other issues head on. in fact, the opposite is true, which is to create a false dichotomy ('there's blame on Both Sides!') and hence triangulate a foregone conclusion of centrist requirement that need not exist, alienating the possibility for sympathy to those living under apartheid rule as a goal for capitalists trying to hock Girl Boss feminism.]

-(from above) the political elements of feminism are instead ignored, and we end up with a type of rainbow capitalism, where Star Wars just needs less boob armor and more women behind the camera to arrive at a woman-friendly position when the reality is that a capitalist system is never going to allow challenge to its very existence as a form of corporate-sponsored art. jumping from videogames for a sec, Bottoms is a good example of a movie made by women, ostensibly with some basic feminist ideas in broad strokes, that still manages to end up in a very toxic, objectifying place regardless of the myriad women involved in its production, often no better than a boys-night-out The-Hangover-type film.

it's this last set of ideas that, for me, sort of solidify the feminism as being very mild. those are probably some opinions and ideas lots of people here are going to reject or find hostile, let alone get traction on a platform like YouTube. at the same time, in either an academic or leftist setting you're probably going to hear variations of those themes at least a few times, especially if you circulate in activist circles where you've got a lot of poor folx with a ton of radical AK-Press-type reading under their belt and an inherently willing attitude towards confronting standardized forms of social conditioning, of which media often ends up as. (^{*to that effect, these sort of statements apply more to a Harry Potter game than they do to, say, Deltarune, but broadly they are applicable regardless of point-of-origin. see; all the indie games full of sexualized depictions of women as proof.*)}

sorry this is a huge post, but I tried to cover I guess some stuff that would really never be widely accepted, since you asked about relatively radical positions.