The first Challenge also got changed over the time. It was at first by 30sec only, and this was impossible without buying more time. And yeah, the only bad Challenge now is #10. It costs 6 Crowns and even the first one is not enough time.

I think the dev. released the Game without balancing the Levels well, but at least they try. I just wished there would have some sort of patch notes. Because they do changes, but you have to figure it out by yourself.

Like, they put in Metal junk drops in Golem Totems, so you don't get only Safe Parts.
And i think they removed the Fullscreen button on the bottom, that causes missclicks.