Thank you for the kind words, glad you enjoyed it! And you're right, Nora and this were both submitted to the Tomb Raider gamejam, it's fun to see we had similar ideas.
A few hints for the secrets:
1: the desert sands are keeping this one safe
2: don't rush through the entrance
3: instead of climbing up, climb down
4: carelessly left in a passageway (can I guess that this is the one you found?)
5: don't get distracted by the treasure