Well, the afterword (beforeword? I dunno) itself calls this thing "slightly yuri," so I don't think that it'd be too unreasonable to call it slightly yuri.
It was more of the fact that they made it seem that "Slightly Yuri" was a sub-genre of Yuri the same way as "Shojo Yuri", "Josei Yuri", "Seinen Yuri", "Shonen Yuri", and "Subtext Yuri".
That said, I'd at least give this thing props for at least being more yuri than... I don't know, any cliche SOL thing filled with lame subtext.
I'm now scared to ask what "SOL" is.
But yeah, this was an overall solid doujin. Sure, it may not have much but It still succeeds at what it tries to deliver, really strong subtext.
I actually have to apologize here, since I wasn't trying to imply Slightly Yuri was its own sub-genre, more like a level on the Yuri-o-Meter, that ranges from male-oriented "girl on girl is hot" moeblobs from the popular otaku shows (which is what this is and is as drpepperfan noted, tend to feel soulless since yuri is just a fetish to these people, 7/10 times they also draw yuri couples from K-ON or Kancolle or whatever getting raped by faceless men without a second thought) to generic school girl "but we're both girls!" doki doki gender dynamics up to some resemblance of actual lesbianism written by wlw (or at least fujoshi women who like yaoi, yuri and het, i.e. the love freaks) that feature more than just the average scenarios and archtypes to finally the non-moe art filled with so much realism you'd assume they were autobiographical, clearly written by actual bians, probably in queer magazines instead of Yuri Hime or whatever.