This is really creative! I think with more time, this could become a genuinely fun idea, with projectiles being able to change size midair. The physics were very responsive, and I can tell you spent time on that.
The controls felt a bit jank though, especially with having to position my mouse at the far right of the screen to fully draw back the bow, as well as having to spam the "grow" and "shrink" buttons instead of just being able to hold them down. With a bit of polish, this could feel really good.