Typically shoot em' up games where the emphasis is dodging a large number of bullets on the screen at once. Bullets form dense patterns on the screen that require precise controls to avoid.
Suggest updated description
A card game where the construction of a deck is the main focus of gameplay.
Explore games for Android tagged Bullet Hell and Deck Building on itch.io · Sell your games for Android on itch.io to have them show up here.