Tried to run this on Linux but couldn't make it work even after installing libsdl2-image-dev. But maybe that's just a problem on my end not in the build. So I played .exe.
I don't really play bullet hell games so I didn't get that for. Never the less this game has a certain charm to it. Hope you add some light story to this somewhere down to road. I've not played the original but I liked the silly halloween edit.
Happy Halloween and thanks for uploading!