I'm not american but I played it. Really cool, innovative pedagogical project. You guys could make a version to release on Steam. Also it needs fullscreen.
MSCHF tried making a Steam page. It got banned on the same day the game went live.
As for the motive of Steam's ban, anime-themed visual novels can be quite hotsy-totsy with this one not being too lewd. Steam tends to disproportionately target small and independent developers with banishments while major videogame studios get away with quite a lot (mulling over that, this is similar to how Spotify treats musicians, actually).
Steam still bans r18 content arbitrarily, usually localizations of Japanese visual novels. For example, Steam banned CHAOS;HEAD NOAH less than 60 days before its release date without explanation and only relented because of community protest. The remastered version of the game released doesn’t even contain r18 content though the original does. Even more puzzling, Nintendo allows the same version of the game to be sold on their site for the Switch. WTF? The C;H Noah is too adult for Steam, but OK for Nintendo?