BoomBrain is an arcade style shooter.
You need to prevent enemies touching the edges of your screen by shooting them.
Your character moves and shoots if you press the hotspots on the screen.
If you press twice on a hotspot your character shoots twice etc.
The longer you survive the faster the enemies get.
Each level is progressively more difficult than the previous, the last few levels are just pure chaos.
When you die you can continue infinitely.
You can also pause the game when things get too hectic.
If you don’t continue, the game ends and you have to start from the beginning.