If you click on Echydna, it's the very WIP Automation screen. it's not yet explained because it's not fully implemented yet.
Studio Echydna
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Load your save online, then go saving again, you would have an option to Download it, you can also press the download button of a save in the save (not load) screen, the file should start to DL immediately. Then place your save (a json file) in the folder AppData\LocalLow\Studio Echydna\Isekai Parlor Simulator. At this point the save should be loadable in the exe version.
Summer clothes have one edge being that the neutral temperature would be supported as well as a +1 hot one (aside for the purely visual thing). Stripping only set the new standard 1 degree higher: a stripped girl in a normal Temperature will be cold but a girl with hot clothes will not. Indeed it's still still less powerful than the winter clothes hence the cheaper cost.
Futa was the other option we presented to Supporters before developing the Yuri Update. It probably will appear in another new poll someday. If we implement futa, it's quite possible that futa-on-male will be implemented as well, with probably an opt-out option as we know that some of the players really don't like that tag.
"Can you play as that lamia on the front?" Well arguably your are playing as both the isekaid' human and Echydna (the lamia) as co-manager of the parlor. The story mode also follows the 2, with Echydna having a certain predominance among the other female characters. I hope I've answered your question.