I think Bromius' kit is a little disappointing overall, given that it only really does one thing without much nuance.
Our first and second abilities are fine in terms of their core functionality in a vacuum for now, though they both still need some work.
But Song of Growth is really just kind of boring. You really just press 3 to do more damage with 1.
I think scaling up the players model and all equipped weapons could be a lot of fun, assuming DE has the technology to do it.
Functionally it would give us larger hitboxes, larger projectiles, proportionally faster movement speed, and a larger hurtbox.