Touhou Crisis Scarlet plays like a Touhou shooting game in most respects, however, there are some differences. The final boss got a good number of spell cards, but it does not affect player’s score. Since timer is running backwards, and the score is calculated directly from the number of seconds remaining, the best strategy to achieve high score is defeat them as soon as possible. Bomb basically unlimited and the bar will be filled slowly if the player continues to destroy enemies.
Here´s gameplay video by Pruns