178 is now dig 15 meters in 6:10 with 5 jewel colors. I played it early today to get extra stars and passed so it's definitely doable. They must have listened to everyone's complaints.

As for 180 you can try to keep refreshing (just don't touch anything before you do) until you get multiple snakes with the same color heads (so you can use a diamond to clear them) or matches right next to the crates. I think it's at 2:25 (I just played it to see but forgot) but the doom jewels are a little tight with only 20 seconds and not much space to make matches.

Don't give up, you'll make it through!