Really cool idea! I especially like how you can break red projectiles with specific timing, and the cost benefit of being big vs small at any given time. I would suggest maybe making it so that the blue dots turn red when your small? I was really confused at first for when I could get points for them-- also maybe the timing for the invincibility frames could be extended a bit a bit? It felt a bit too tricky to time. All in all really awesome submission though! Nice job on 48 hours :)