The character is a pleasure to move around and boost. I like how the scaling looks like the character is deflating like a balloon. The particles give nice feedback. I found the level difficulty just right for a jam. The last few levels took a few tries, but they were doable.
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I'm really glad to see you are enjoying my game, appreciate that. You are right, setting the difficulty progress in level design is more important than level design itself, especially in the jam. But I still think I haven't done good enough in level design, cause I knew I could do better at that time, but I was really exhausted in building mechanics. I will perfect them in the future, thanks for your reply ! :D