Love the game! Just a couple of minor suggestions.
I would like to suggest changing the name of the save data folder. I run Linux, and I have other applications using a 'data' folder in my home directory. Something like 'toa-data' would be great, or even better '.toa-data' - note the starting period - as that would make the folder hidden by default on Linux and Mac.
Could we have a library of encounters similar to the gallery for encountered characters? Sometimes during encounters I double tap my touchpad and skip a page or two on accident. Another idea could be a simple game log.
Finally, do you need/want any help with development? I have a fair amount of Java experience - I've built and deployed Java/JavaFX desktop applications before.