This level was probably designed to be a boss level or something like that, at least I think that from the music... And it's the last music. Even the reactor room is large room. It seems to be designed to be a boss fighting arena. Then it was reverted to have reactor instead... Who knows.
Anyway this level is not easy if you want to get out of this mine with 100+ shields. There aren't too many shield spheres on this level, I counted maybe 3. This means you must do an almost damageless run. Also don't waste energy because the charger stations are quite far away, you need to destroy 4 red hulks that requires a lot of energy.
If you just want to survive only, this level is easy. Red hulks can be sniped or missiled, and you can beat the reactor by rushing in invulnerable.
Calmarius currently has 50,749 views spread across 102 videos for Descent II. His channel published over 1 day worth of content for the game, or 39.49% of the total watchable video for Descent II on Calmarius's YouTube channel.