I didn't realize there was a final boss at the time of commenting this and have now fought it - that was nuts, super well done!! It reminds me of Fez, or the Paper Mario game where you can switch between 2D and 3D. Really cool concept to bring to a bullet hell, well done!
Thanks for playing through more of my stuff! I'm glad you liked it. Trying my hand at making one really made me grow some serious respect for bullet hell devs. On the sound effects front, they were all made from DrPetter's 'sfxr' tool. I know you mostly make your own audio, but sfxr is super useful for setting up some punchy beeps and boops when you're on a time limit. Defo big recommend for jams.