Thanks so much for playing, and all of your feedback! I appreciate it, and it'll definitely help me going forward as I continue to build games.
TwoGoku is in a weird position because it was A) experimental, B) an in-joke taken somewhat seriously, and C) primarily made for a handful of people on the Magical Girl Game Jam discord.
I won't pretend that the experiment was a resounding success, or even close to that, but it satisfied what I was attempting to do. I plan to finish it, but honestly don't think I'll be making major changes to the gameplay. It's built fairly janky (being a jam game) and it's going to be hard enough to find the time to making all the rest of the levels... altering the core gameplay will unfortunately be too much work for the amount of time I'm willing to spend on this.
That said, you've made some suggestions that I can definitely try to add in the future, such as better call outs for invulnerable moments during boss fights, etc. When I get back to working on this(TBD, no real timeline right now), I'll look over your suggestions and see what's reasonable to try and add.
If you want to try a more standard SHMUP in the series, check out "June Mejos and the Moonlit Curse" on my page. That was my attempt at something more normal in this genre.
As for the soundtrack, I'll ask Sunny if there's anywhere he posts his music!
Thanks again for playing, and taking the time to leave all your feedback, it's very helpful!