While I’m not sure how much of a difference the CPU and RAM will cause, my current laptop has the same GPU, so I should have a general idea of what games will work on your laptop.

Since you mentioned RuneScape, I do actually have RuneLite (a third party client for OSRS) on this computer and it does run fine. I haven’t tested it yet but I’m pretty RuneScape (RS3) should also work well. The last time I ran RuneScape on Linux was when I had a computer with an Intel HD Graphics 3000 and I was able to get an almost playable frame rate at my usual graphical settings, so I’m curious about how well it’ll run on my current computer, but I currently don’t have any interest in playing RuneScape at the moment.

As for other games, if you’re interested in games similar to quake, I know that World of Padman worked pretty well when playing offline, so I don’t see why it wouldn’t work well on your computer. It might seem like a weird choice at first but the levels are quite large and detailed, and the music is also pretty good as well. It started as a mod for Quake 3 before it became it’s own standalone game. This can either be downloaded from their website or from Flathub.

Similar to the previous, there is another similar game called Urban Terror. Similar to World of Padman, it also derived from Quake 3 but it looks and plays more like Counter Strike (or at least what I think CS plays like). I personally didn’t care for this one as much but some people might like it more than WoP. This can be downloaded from either their website or from Flathub.