Haha it took me minutes to figure out how to play. I think it is a little misleading that the bottle can color the washer too, I thought I met a bug since my slime didn't change after wash. I also think adding some highlights on the three slots at the beginning of the game would be helpful for players to understand that's where they are targeting to.
I get that you want the player to figure things themselves, but I think that might not fit very well with the time limit, because when there is a counter, the player always gets nervous and want to make things works immediately. I think maybe either:
1. add a tutorial part that does not have a timer, and after the player understands how to play the game, then the timer starts.
or 2. don't have a timer at all, just let the player keep making more matches, and unlock new characters/washer machines to progress the game. this might be too much for a jam game but I think it worth thinking about doing something like this and make it a full game!
Overall a lovely game!