Shoal Thing moves around like a school of fish and likes to play.
Glide a finger across the screen and they'll scram like it's a predator. Press with two and they'll circle in like there's food around. Tap with three fingers to turn on neighbour lines and transform the individual fish into Shoal Thing.
The free version of the app lets you be a predator. The full version (available by in-app purchase) enables all three features.
Support notes:
Some HTC devices do not pass 3 finger taps and gestures through to apps. This affects the full version of Shoal Thing only. It can be changed in the device settings – look for ‘Display & gestures’ in the ‘Phone’ section.
Start with school of fish in the free version.