Big dick neo geo shmup energy. I made two waves on arcade and one-and-a-half on Storm Vulcan difficulty, but I'm also not really that good at shmups in general, so I feel difficulty is balanced pretty well.
I also tried starting level 2, it didn't crash for me but it also didn't start, so I assumed it was just a placeholder, or was it supposed to start?
Like mentioned below, the visuals are great, backgrounds, enemy designs and of course the WARNING KILLER MACHINE IS COMING text (the most essential part). I also liked how "readable" everything was, like I never felt I lost sight of the bullets or anything cheap like bullets being too similar to the background/ships etc. Like I feel that's often the detriment of bad shmups, the unreadable clutter, but that wasn't the case here, so great job on the design!