I really liked this one!
Excellent premise and execution!
SPOILERS BELOW
The character dialogue is great, the characters make sense and the story flow has a good pace.
The puzzle is implemented nicely with the story, adding to the urgency.
The only issue (that may not actually be an issue) would be the exposition near the end, where Everest explains the whole backstory, and then the main villain also explains his plans and then everything gets resolved.
This part felt a bit cartoony to me, but if that was the intended vibe of the game then I just took the beginning too seriously.
Overall, it was pretty great!