Thanks! Yes, the intensity does increase from wave to wave and drops back down again when choosing bullets and pausing.
We have an update posted with fixed aiming (huzzah!) as well as addressing a few unintended behaviors & bugs. There are a few synergies that currently exist between a few of the bullet types that make planning out bullet order a little more interesting, but we're unsure if that's something for players to discover or something we should hint at and tutorialize more. Would love to hear your thoughts on how to better represent that!