Hello umbrellacore444, and welcome to the forum. Please take a moment to read the forum rules.
I've discovered a nice solar system
When you post about an interesting world/system/object in SE that you want to share, you should post its location code as well.
the ocean is 'red' in colour
Many worlds in SpaceEngine have red oceans. Oceans may be green and blue as well.
The atmospheric pressure is just below 0.2 (20%) of Earths pressure - wouldnt water 'boil' off because the lack of pressure ?
No, 0.2 atm is quite enough to support liquid water, though it would boil at a lower temperature than it does on Earth. Water can be liquid at pressures as low as 0.006 atm, though at very low pressures it is liquid only at a very low range of temperatures near the freezing point, and would probably suffer from accelerated evaporation.