Fun game! I couldn't find how the theme tied into it but if I just missed it let me know :P. Some feedback I would have is giving the player a bit of a warning before an enemy spawns, or having them spawn offscreen so they don't spawn on top of you.
I actually forgot the theme part :) I really wanted to make bullet hell game soo ended up soo focused on that that I forgot about the theme LOL. Thank you for your feedback I always appreciate it and Ill take note of that see if I can update it in the future!