As we announced in "Why Early Access?", we are plan to add following features:
more stage areas
more chapters
more special bullets
more background music
more achievement
store system
quest system
portal system
enhance UI, sound effect, visual effect
However the feedback shows that we should add story first and remove special bullets. We need some time to consider these changes, so the release in August will contains more stage areas and general performance improvement. Further detail schedule about story and special bullet would be announced at September.
Steam Announcements : https://steamcommunity.com/games/1112250/announcements/detail/1610519172275609014