The game feels good overall, the music fits, and the main objective is easy to understand, which helps make it fun. But so far, the strategy just seems to be about rolling the right ball to power up one strong ball, and that’s it. Fewer balls means less effort, so powering up a single ball is always the best option.
The strongest balls clearly have a homing attack , so player involvement drops as the game goes on. You throw the balls, and then they mostly do their own thing. You can't control when the enemy AI fires back, or who it targets, which makes things feel a bit random.
It might help if you could charge your shots, or time your throws like a tennis swing, to make aiming more skill based. Right now, you can’t see the next wave coming, so the only strategy is: power up the best ball and let it carry you.
If the slight idleness on the player’s part is intentional, then sure, go for it. But in that case, you might as well automate the base bouncer too and shift the player's focus elsewhere. The only meaningful interaction would then be between levels, choosing the right squad like it’s a soccer simulator and activating abilities mid match like it's WoW.