0.4.0

## Added

- New LevelData fields

    - `chance` - json data that controls the rariety of `enemy-easy` and `enemy-rare`

    - `speed_additions` - json data that adds to the speeds of the 3 enemy types

- `LevelData` typedef to make things easier

- New global variable for the game version: `APP_VERSION`

- New application Icon

- Splash Screen

## Fixed

- Bug where every enemy would be earth enemies

- Level Select not reading level json files on web

## Changed

- Difficulty of earth: now `easy-ish`

- Difficulty of heaven: now `medium`