Thanks for your feedback. What device are you using?
I tried on Nexus 6 running Android 7.1 and Samsung Note 4 running Android 5.0, objects in the mobile version move not smoothly on both phones but the browser version is smooth. I let the program run for a minute and still no improvement.
Maybe flickering is a strong word, but if you look carefully, you should see the objects in mobile version have rough movement (maybe sometimes move back a pixel or so? not sure what's the cause of that rough movement feeling), but the browser version has very smooth movement, even though both are running at near 60fps.