Worked fine when I made the post. Really frustrated that an imgur link somehow died less than 24 hours after being created.
Anyway, the image shows the RAM dial on the bottom-right, with a reading of -0.71GB, with the little bar indicating current usage going the opposite direction from the bottom (going to the right instead of to the left).
No possible way I could effectively recreate this happening, unless I played that game for like 5 more hours. You'll just have to take my word for it.
I think it might be Flash finally showing its age with new technology. Haven't had any issues with anything else while using Opera GX.