Now we only need a hero that can share a Eve trap route save
If I got this right, if you visit Summertime Saga's official web site and download/install the save file that the Kompas team offers you can unlock all scenes.
You obviously want to rename the save file to an empty slot you have available. Start the game and load that file, go to the main menu and look in the Cookie Jar all scenes are unlocked.
And by all I mean all the available scenes you couldn't unlock due to the fork-offs or paths from decisions you made. I would highly recommend not using the Kompas save until you've completed everything you can, including unlocking any remaining scenes.
I made it thru 0.20.5 and out of curiosity I downloaded the 0.20.5 save from the Summertime website with the intent on trying to find out what scenes I was still missing. And after loading the Kompas save it unlocked every scene, and any scenes I was trying to keep track was unlocked. So I ended up losing where I was at with the various women.