I think this is the best roll I've ever gotten in a gacha ever. And it was my first 10-roll, too
Ayyy, have fun with your Harpoon Gun Bear. I didn't get Rosa with my pulls, but I at least got Shining. Tbh, I was pulling to try and get Istina, but ended up with 2 Leonhardts instead. :(
Also I don't think the first two stages are that hard, you just need to get used to the enemy pathing. The second stage especially since the mages don't just go straight to the blue box, they walk back and forth for a while before actually going into your base, leaving you time to activate the detectors. You can complete both of the first stages with just 3 stars (+ Shaw for the 1st stage). You can see the strategies from KyoStinV, here's stage 1 and stage 2.
The devs literally design stages to be winnable with low rarity operators, except the harder stages that might require 5 stars, sometimes a 6 star if it's like, extreme mode or challenge mode.