Just a heads up that I run a Discord entirely devoted to indie shmup development.
There are channels for the major engines, shmup creator, STG Builder, Unity etc
Also channels for general chat, design theory, art, music, Japanese chat etc.
And a WIP section to show off and update work on your projects.
This group is focused on 'STG' - 'Shmup' projects. Games in the style of Raiden, R-Type, Ikaruga, Ketsui, Radiant Silvergun, Drainus, Zero Ranger etc.
That means no 'shmup adjacent' style games, twin stick shooter etc..
Come join here (if link dies, let me know and i will update it)
Introduce yourself in General chat, your project (or planned project), what engine you use etc:
https://discord.gg/hkduxSzQsX