Critters would be small entities with relatively simple AI and animations. They wouldn't affect the gameplay in any meaningful way, but they would make the game feel much more organic.
Small Fish: They would float around the level randomly, maybe form clumps and wouldn't drift too far from each other. When a player gets too close they get scared and swim away. When a bullet passes closely, they could panic and swim away quickly, completely disorganizing the "group". If hit by a laser or a bullet, they could turn into a tiny skeleton (or sushi for family-friendliness) that drops to the ground.
Crabs: They would walk left-right randomly and stop for a few moments, but they wouldn't walk off ledges on their own. If a player gets too close they would walk away, and drop from platforms if there is no wall to stop them from doing so.


Critters would be small entities with relatively simple AI and animations. They wouldn't affect the gameplay in any meaningful way, but they would make the game feel much more organic.
Small Fish: They would float around the level randomly, maybe form clumps and wouldn't drift too far from each other. When a player gets too close they get scared and swim away. When a bullet passes closely, they could panic and swim away quickly, completely disorganizing the "group". If hit by a laser or a bullet, they could turn into a tiny skeleton (or sushi for family-friendliness) that drops to the ground.
Crabs: They would walk left-right randomly and stop for a few moments, but they wouldn't walk off ledges on their own. If a player gets too close they would walk away, and drop from platforms if there is no wall to stop them from doing so.