Pop a balls

One button game genre about shooting bullets to pop a balls.

Control:
- hold 'z' or 'left click' button for fire bullets. 
- Firing bullets will make player move slower.

* v 0.2.2:
- add levels.
- game difficult base on levels.
- support mouse.
- improve graphics.

*v 0.2.3:
- tuning difficult levels
- add background.

*v 0.2.4:
- improve gameplay.

*v 0.2.5:
- export with new pico8 version.
- add binary for windows, osx, linux and raspberry pi.