I'm not really a bullethell guy so I won't say much. It is amazing you got it running on the Dreamcast though, I'll always wanted to try and dev for it since people say it is so easy. Game didn't work at all in the browser, Firefox 56.0.2 64-bit, so I downloaded.
I got to the end boss of the 1st level before my first death. It is a fun game but I don't think I'm good enough at the genre to get much further. As such I don't have any complaints! Great job!
The easiest way to start Dreamcast development is probably still KallistiOS (https://github.com/ljsebald/KallistiOS). There's also the Titan IDE coming out in December which tries to be something like Game Maker, though I don't know how that's gonna turn out.
You'd still need either a Coder's cable, a BBA or a LAN adapter to connect your DC to the PC. I would personally recommend the LAN adapter since it's not slow like the Coder's cable and doesn't cost an arm and a leg like the BBA. Alternatively, you could dev with an emulator like NullDC, though from my experience it tends to struggle with homebrew. Some Dreamcast devs actually use CD-Rs and always burn a new session for testing, but that's pretty much like having a compile time of 5 minutes. Maybe it's possible to dev with an SD card adapter too, but I don't have one so I can't say.
Anyway, thanks for playing and the feedback! I'll have to look into the web version again.
