When I looked at the game source I noticed u used a new image for each new massage and u use renpy while you can use a simple code (probably less than 100 line) to manage and do the whole conversation this might without all the images and with out renpy core that might make the game very smooth and very easy to develop and also will make the game a really much lighter (around 50 migabite).and by the way the game misses a lot of important files -(android version)- so it isn't able to be installed.