The original summoned Spaceventures characters are all at Level 1. You need to consume a certain amount of BSCD to level up your Spaceventures. The higher level your Spaceventures is, the more BSCD you would need to level up next. You could earn BSCD through Daily Works, PVE, etc. The Level is one of the most important attributes a Spaceventure has, so it will directly increase your power and working efficiency, but it will not increase your basic data. A high-level mining task needs Spaceventures with a compatible level.