Acting upon the feedback I've received, I decided to add a "Clue Chart" to the newest build of the game. It will show you which clues you managed to find (and which you didn't) in a character's route the moment you trigger a single bad ending for that character. You will find this chart in the Quick Menu of the game (right in-between the "Load" and "Settings" buttons). Once you get stuck, the chart should give you some kind of idea what routes to explore in order to advance further!
As always, downloading the new build will keep your current progress and save files intact.
I hope this little addition will help you out and make SoulSet an even more enjoyable experience!