So I've been playing Alyx on normal and just finished the stage with the flashlight. I don't know if it's because it's still early game or what but it feels way to easy so far. Less than 3 enemies have even touched me. Does it get more tense later on? Or should I restart on hard?

Also, am I supposed to kill all the ceiling tentacles to see if they drop resin or avoid them to conserve ammo?