Posted January 23, 2016

Instead of trying to magically become shmup designers themselves, they brought on-board a "shmup fanatic" to design and balance that portion of the game (username "Misery" on their forums), and they built the base game such that new enemies and bullet patterns could be added with minimal programming so the specialist could focus exclusively on that aspect of the game.
In addition to that, they also took contributions during alpha/beta, so some additional content was contributed during testing.
The final game still allows for the addition of new enemies, bullet patterns, and rooms, which I suppose would considered "modding" now that the game is out.
Post edited January 23, 2016 by paul1290