Oh man, I wish your game was on the browser so that more people would play it and I got to read more letters, I think I only found from 3 different people. Probably from you guys. I had fun just reading the few ones I found from you, so I can only imagine how cool it would be if there were tons of them.
I really liked that I get to choose a frog as my character and that the dog picked up my bottle and put it in the water. The only problem I see is that after you send 2 bottles and read a couple, there is nothing else I feel like doing, maybe you did this on purpose to make it simply a short break to reflect on really interesting questions and chill with the music.
Nice Game, I see it as being good for mental health, so in my opinion, you accomplished the goal of this jam.

PS: The music might be a little too fast, maybe a slower bpm would fit the slow and relaxed nature of your game better.