Bizarre shader bug with portal 1

Earlier than I clarify the problem:

My telephone is a Google pixel 9 professional xl operating android 16.

Now, I put in (or tried to) portal 1 utilizing the supply engine port discovered within the discord for nillerusr port of supply for android, and I needed to play portal 1 on my telephone, so I downloaded the engine from the information, and put in what I assumed I wanted, copied over the portal recordsdata from steam on my PC into my android telephone inside storage > srceng excluding the bin folder, and ran the sport, the principle menu appears to be like high-quality, however then I am going into the primary chamber and it appears to be like like this (screenshot supplied)

Any and all assistance on this matter can be tremendously appreciated.