Welp. It's time to re-do enemy... Everything. Almost everything. I'm going to start by making all enemies have weapons of the proper power for their level, rather than sharing weapon power with health and speed. As a part of that, I'm going to be re-doing enemy weapon firing patterns to put far, far more bullets on the screen. This may backfire in terms of hilarious difficulty increase, but right now it seems like there's far too much safe space that a player can just set up camp in.
The time of safety is coming to an end. Prepare for bullet roses.
After the enemy weapon changes comes enemy pathing changes! There's going to be stops and starts and more concrete shapes for waves to come in, rather than just 'two or three random points in a row.'