Amane might very well be a saint.
Well I don't like polyamory much and don't think it works in 99% of cases, but for all the rushing at the end, I feel this conclusion was consistent with what was set up. Could Kou's feelings have been explored more? A looot. It's not even clear if she had feelings for either of those before this point. But I believe the author always had this conclusion in mind. The line "I was in love with this couple" actually got me good haha.
Lizard-senpai's motivations seemed a little bit unrelated to the actual issues set up with her. I get that she loved Amane, but she didn't really harp much on having lost her club members before. She conceded before the contest even began too, which is really not set up in any way. That just came out of left field. Undermines how Kou's picture actually won.
This series fell victim to the cutthroat manga industry, but let's appreciate that it had a lot of things going for it. There was lots of discussion (47 pages worth by now!) for not even 10 chapters. It aroused a lot of interesting debates and had the right amount of ambiguity to keep readers second guessing.
As far as rushed yuri manga go, I'll take this over any of the bland samey cutesy ones.