Thanks for playing! It's helpful to hear that the first level took a little figuring out, but that things flowed better after that. I appreciate the ideas for music, sound effects, and more characters. Adding more friends might change the focus on Tate and Yoko, as you mentioned, but it's an interesting idea!
Quick thought – definitely not saying it’s remotely useful, but if you did want to add a bit more challenge on later levels, you could maybe have Tate & Yoko invite a “guest” or two to their picnic on some levels, where each guest is a one-off that has a unique size or shape. shrug Might add a bit more color and variety as well. Again, just a random idea. Good luck!