Flappy pig sprite exceeds screen boundary

I was surfing though repositories then i came across keenwon/flappy-pig and decided to play the game only to then discover that the sprite usually exits its prescribed window
Below is the problem in GIF format

And another problem is the origin of the pillars should be set well in order for accurate scoring, the character should at least get in-between the pillars before being scored.
Thanks for going through
Operating System : Windows 8.1
Browser: Google Chrome Version 63.0.3239.108 (Official Build) (64-bit)