Well, I tried to look for the video I saw but couldn’t find it. All of the videos I could find have the game in monochrome with a high frame rate, while the video I remember watching looked similar to the GBA version but with a significantly worse resolution and frame rate.
After looking through some other Doom on “insert device here” videos, I couldn’t find it but I found one where the gameplay looks similar (even though it’s a completely different device and the game is clearly modded). The video is called Doom 2 on optimus maximus.