1. Blood
Invaders
By Markus Ansorge, Philipp Holl, Robin Otto, Christian Schnelzer

2. Recap 2 player co-op shoot ‘em up Main gameplay Player 1: Bacterium
Player 2: Virus swarm
Main gameplay
Shoot immune cells and chemicals
Evade obstacles
Infest body cells
Charge and use abilities

3. Design Revisions Changes Critique More interaction planned
Implemented & Planned
More interaction planned
Merge to single character with shared controls
Revival by other player or at checkpoint
Fluid mechanics
Bacterium can only rotate slowly
NPCs are exposed to Brownian motion
Fleshed out player movement and attack behaviour (see prototype)
Critique
Setting
Immune system simulation
Not enough co-op functionality

4. Physical Prototype Screen space approximated by hex field board
Characters are LEGO bricks
NPCs move from right to left instead of background scrolling by
Round-based actions and enemy spawning
Shooting precision (skill) is approximated by rolling dice
Player movement very different between bacterium and virus swarm
Enemy behaviour adjusted to fit biological counterparts

5. Physical Prototype
Demo Video