Collect fancied butterflies.

Tap to catch butterflies.
Catching butterflies rises the level, and lots of flowers open up.

Flowers attract new kinds of butterflies.

Catching more butterflies at once, level will be raised earlier.

Butterflies appear as time advance even the game isn't launched.

STORY
This archipelago is far from any other large islands or continents. You were assigned the teacher of the small school in the archipelago and found the predecessor’s notebook. This notebook indicates that there are an uninhabited island where lots of newly-discovered butterflies live. Island's residents have known the butterflies since early times, but they don’t think these are extraordinary.
In the notebook, the predecessor decided that he didn’t publish this fact because it will only incur poachers. But he researched and recorded the butterflies. At the end of the notebook, he hopes the replacement continues doing the same thing. After you read the notebook, you would collect.butterflies to make sure the content of it.