Why is it so slow?
And why it shows reflections of all sprites when choosing the modern graphics? everything seems to be mirrored.
It's a potentially great game, but its slowness and mirroring issue makes it unplayable.
The slowness may be due to your computer. It's supposed to run at the same speed as nnormal Pac-Man, so if you aren't experiencing that, it may be an issue on your end. And Modern mode is supposed to have reflections as if the floor is shiny. That's intended. You can see it in the fourth screenshot above on this page.