Thanks for the feedback! I do have a few solutions to the "breakout problem" for the next magical girl game jam. I'm thinking of doing the abilities quite a bit different (and adding different playable characters). For example, I was thinking of adding a temporary block-seeking powerup, or a powerup that pulls the ball to the x position of the paddle (this one is a bit problematic in practice though).
Next time I will test more in full-screen, I pretty much only tested in the editor which was at the intended resolution, but the text looks awful at full screen. I'll probably also not force the low resolution, it was a bit of an experimentation.