Update Friday - 2019.06.07

Feature

* add chasing and bumping enemy ai

* adjust player shots spread by mouse distance

Enhancement

* update battle scene ui

* remove player dash

* update bullet image

Bugfix

* fix custom bullet disappear when drop on itself

* reduce hp powerup stack limit

* disable development option in release build

* fix teleporter position

* fix seal minimap icon

* make sure enough room for seal