That’s not Stardew Valley
If you’re in Game Mode you can click the cog button, go to Compatibility and select a proton version. This may help
Edit: you may also need to make sure you have Steam Play enabled. I believe the latest system update enables this by default.
They didn’t seem to explain how you’re meant to verify your age.
Archive.org is probably the best and safest way to get it now.
https://archive.org/details/grand-theft-auto-2_20231230
I hope this doesn’t require a PSN account too.
I think a lot of PC players are waiting on the steam release.
PSA: if you own the crew, consider taking action.
https://www.stopkillinggames.com
Gotham Knights
Unfortunately it’s gone from there now too
Looks like they removed Liberty City stories and Chinatown Wars from individual purchase on iOS and put them behind GTA+
That’s not Stardew Valley