Just installed the beta version from the website (instead of the play store version) and it solved the problem.
Thanks !
There are numerous videos on YouTube showing you how, so i won't get into detail, but here are the steps :
1. Install EasyRPG Player. I use the beta version from their official website (not from the playstore).
2. Download and unzip the game from this website. (It is not on the playstore)
3. Load the game with the app on your phone.