add new music~

1. Optimized the difficulty of the game in simple mode, adjusted the level content
2. Fixed the bug which makes player respawn before saving point.
3. Added tips for BOSS battles
4. Added game tips
5. Optimized for novice guidance

1. Optimized button settings
2. Adapted for iPad
3.Added game tips

new trailer update，new description

Adjusted the picture of the store page