Okay, I've tried the updated app, and it's definitely much better. In the past I always had to adopt the strategy of B-lining it to the goal, and then heading straight out; no exploration, no treasure hunting. I found it was the only way to survive.
Now, when I played level d4, I had enough extra HP that I felt I could do a bit of treasure hunting. Now instead of feeling like I needed to survive against the app, it suddenly became about how much I was willing to risk in order to gain more treasure. The game was now mine to lose, depending on my actions. I feel that's the sweet spot.
I also managed to beat level d6 for the first time, although I only had 1 HP left after completing the goal, and had to skip any possible treasure hunting on the way out. Also, I had a Mother of Bandi with me, and I definitely wouldn't have made it without her abilities.
Just my usual feedback, feel free to take or leave it.