Thanks so much for playing the game and sharing your feedback! I’ll definitely beef up the path guidance to make it way clearer for players.
The heroine’s notes mention multiple times that Dr. Lior keeps a black hole in the Quantum Training Tower — that’s a big hint there’s a hidden passage inside the tower, right behind the central pillar.
In that hidden passage, you can grab the Quantum Jump Drive Core, and also learn how to get to the other door at the broken bridge. There’s a hidden door in the top-left corner of the broken bridge, and you can use the quantum jump gun to get up to it.
Once you’ve got the Drive Core, you’ll be able to enter the Black Hole Jump Chamber and travel to the Solar Station — just a heads up, you’ll need that core from the Quantum Training Tower to unlock this.