Cosmic Bustle 1.1 New Year Update

Changes:

- Difficulty levels! Now you can choose a mode that is comfortable for yourself.

There are three modes:

[Easy] Short waves, long time between the appearance of new enemies. 

[Hard] Full waves, usual time between the appearance of new enemies.

[Insane] Full waves, short time between the appearance of new enemies.

- Various balance changes

- Special "New Year things"