Am I supposed to not get every single log file? I don't want to just try it out and then recognize it was wrong because I played the game too often now.. so could you maybe tell me?

I think the things like "kill 100 spiders" kinda don't work because I killed so many of them ...

because you placed more of the red crystals you can easily bring to the goal instead of using the one captured between the switch-based walls.

After beating the game on Normal Mode, all of my Normal Mode progress (including log files and unlocked levels) is erased. I do still have the gun upgrades. Hard Mode is now unlocked, but why would the game delete all of the Normal Mode progress?? I wanted to go back and replay the levels for faster times, but now I'll have to start from the beginning. If this is intentional, it was a VERY poor design choice....

Shouldn't the top 10 players receive a key for the complete game? I would really like to get it.