Very unique and fun take on the jam theme!
I enjoy the unique world that is laid out here with all the interesting and varying characters, but at the same time I feel that it lacks a coherent pacing, perhaps some sort of story text between levels to set the stage for the level you're entering would help.
As for the gameplay, the concept is interesting but there are some pretty large flaws in execution. I managed to get through the game by just kicking the idea balls in and then kicking them back out if they were dissenting ideas. As for the cut 3rd level, the angel would help the problem somewhat but ultimately the expected gameplay method could still by bypassed by just memorizing which balls are reinforcing and which are dissenting. In the game's current state there's just no real reason to figuring out which balls are which the correct way. I personally don't have many good solutions for how to fix this other than to add more dissenting idea balls so that it's harder to guess the reinforcing ones.
With this, the text boxes flashing on screen as you run past are distracting more than anything, I'd recommend making it so that you have to press a button to talk to the nearby NPCs.
The sound design is fun, the upbeat music combined with the simple sort of kickball sound just make this game feel far more joyful and upbeat.
Don't fret over my critiques however, they're mostly nitpicks aside from the gameplay ones, I still had a lot of fun playing it and enjoyed the character design and overall sort of feeling to the game! Keep up the great work, I'm excited to see what you make going forward!