Oh, sweet! Specialized game dev tools FTW!
Still in development, Shmup Creator by Bulo Studio, looks really promising with tons of editing options for 2D and 3D assets based shmups. In the end it always comes down to how well one can incorporate self-made content and what the publishing options of the creator will be.
Anyways, I’ll be keeping an eye out, always looking for to the point tools and systems. Here are impressions from the twitter feed: