The game is to open the door on each floor, find the escape exit, and move the crystal to the exit to enter the previous floor. The purpose of lighting up a room is to prevent monsters from appearing and to increase power supply. The number of lit rooms is limited and must be chosen, and cannot be random, otherwise monsters will appear everywhere, and you will be slow and messy. Lighting up the room prioritizes the fastest route from the crystal to the escape exit, because If you take away the crystal, monsters will appear continuously.

There is a scientific research crystal on each floor. You can spend science to upgrade the level of the turret or basic resource generator. First upgrade the level of the resource generator, Industry>Science>Food, then upgrade the turret. Choose an upgrade that is not expensive. I chose 7. Industrial Tesla, don't learn from one thing to the other. When you find an escape exit, place turrets along the way to help clear monsters. Bring crystals to the next level. You can get someone with fast movement speed and special movement speed to move crystals

The gameplay is changeable. I don’t know if the hero level can be raised very high. Can I just upgrade one hero and use him to open doors and move crystals? His attributes will overwhelm speed running. If you are interested, you can try it.