If you’re interested in developing a shmup but don’t know where to start then this should help you. Here are 3 threads in the forum providing shmup-templates, which are frameworks with the basic controls and systems in place to quickly create a shmup.
Simply choose the engine you want to work with, download the template and start making your shmup! Please post any questions in the forum. The Unity 3D framework is currently in-design and feedback is requested.