I like the idea, but anything with 10 masses of Jupiter will almost certainly collect a tremendous amount of gas and become a very massive gas giant. You can make it rocky in Universe Sandbox because you can alter its properties. Such a massive planet is unlikely to be rocky in the real world. While life on gas giants isn't impossible, there would be no solid ground for an advanced civilisation to develop. In other words, organisms will most likely appear as microbes floating among the clouds.
In the context of life development, a 25°C to 35°C jump for a single orbit is absolutely massive and is not favourable for life. The surface temperature reading in the game is misleading because it shows average temperature. If 35°C is the average temperature on that planet for a portion of its orbit, certain areas could reach beyond 60°C. The average temperature on Earth is about 15°C, and this fluctuates by less than 1°C in 1 complete orbit around the sun. This little fluctuation still results in great temperature differences from the northern to southern hemisphere, so a 10°C fluctuation on that planet is not a good sign because it means many, many times the temperature differences we get on Earth.
The most suitable masses for planets where a civilisation may thrive, based on our current understanding, is about 2 Earth masses.