Fix bug: the final score is always greater or equal to 0.

Signed-off-by: tungpham31 <tungpham31@gmail.com>
Rename "images.js" to "static_resources.js".

Signed-off-by: tungpham31 <tungpham31@gmail.com>
Add Power-up Module.

Signed-off-by: tungpham31 <tungpham31@gmail.com>
Gameplay using FreezePowerUp module.

Signed-off-by: tungpham31 <tungpham31@gmail.com>
Add a limit for the number of freeze power ups can be used.

Signed-off-by: tungpham31 <tungpham31@gmail.com>