I took part in the jam game "Improve My Game Jam 33" - a good small regular jam specializing specifically in feedback to improve the game. Maybe someone will find the link https://itch.io/jam/imgj33 useful.
So what did we find out? After adding visual indicators, some people understood how to play, others still don’t understand. The next stage of improvement, there may be one of the options: 1) game bot, 2) scripted bot, 3) animated gif picture 4) static picture
to show the rules, and there may be sound effects for danger, bonuses, water level changes, etc