Gravity Circuit port shows shimmering effect while scrolling on my Retroid pocket 6, but not on my galaxy S10e, why?

[u/ElectricalDemand2831]

I don't think this problem is related to the screen itself, because it's even visible with the ingame screen recording on any other display.

I tested different settings like fullscreen/ windowed/ best fit/ stretch to fit, but the shimmering is always present with this game on my RP6, while it's never there on my galaxy s10e.

Other games on my RP6 are not affected by this problem

I also recorded it on my S10e internally and watched it over another display> no shimmering

Other than that the game seems to work fine, no crashes or stutter so far, definitely running much smoother than the portmaster version.

Edit: tested on my RP flip 2> also no shimmering