Hi kleiner, I don't normally leave feedback but this is one of my favorite maps, so I will go over some things;
I'll start with the good!
Your addition of "-bltiX" is great, I've wanted that in 2.0.42 forever.
I also agreed with the majority of your listed changelog - The exceptions here would be, Mushroom damage reduced by half, seems to be a bit ineffective, especially in larger player games, as air can quickly outpace mushroom building.
World freezer absolutely needed a change, as it was awful before, however, their new ability to stop and target and freeze nearly every single unit on the enemy team seems a bit over-tuned; somewhere between where it was, and where it is now, would be ideal as a starting point.
The new goliath unit is interesting, but seems to be quite insane when paired with speed buffs, (gjallarhorn + horn, etc). I'll give it another 10 rounds or so to really argue a change.
Master of elements and the twins being removed, I did not particularly see the reasoning. MoA is a good unit, but definitely not the highest tier legendary unit in the game; I only assumed it was removed to get more usage of the altered linker. The twins are not great by any means, but I don't see the point in removal without an adjustment elsewhere.
Some bugs I noticed through the 5 or so total rounds I played last night;
the "-classic" mode did not turn off the sacrifice alters. They could still be used, even though I assumed that is what the tech requirement is for - in the case of "-classic", i think the building should just be killed.
Starfall appeared to not work on some occasions, notably on my caged murlocs. It cast in the middle of the battle field, but not my side of the board. Don't know if it's a range issue or what, but should be checked out.
I mentioned earlier I like the new "all ultimate builder mode", but compared to the latest other versions (2.0.40), you cannot see your allies/enemies ultimate builder buildings. Seeing the enemies part is subjective, but it should absolutely be visible to your teammates. If I'm wrong here, please correct me
Some things I noticed in this game are different than other versions. I'm not certain what version this is built off of, but things like Well of Pain stunning for 1 second is relatively new to me, and should be listed in the changelog. Unless a lot of these quirks used to be standard and i'm a zoomer; I've played about 3,000 games of castle fight in the last 3-5 years across many different versions, but always the latest of the time. Another example of undocumented change would be the bear howl cast when they retreat, and the fact they become invulnerable.
The new sacrificial alter feature is new to me as well, I'm assuming it's good for stale-mate games, or when you have a rescue strike over your opponents. I'll play some more with it, but the concept didn't strike me as greatly intriguing.
I am also a fan of the simplified modes (or lack thereof), the automatic camera (which, in-place of -cam, should just have a lock on the height until you change the height), and the instant rescue strike. Overall, this game feels very smooth to play, which is a huge improvement on the older one which became sluggish over time and un-responsive.
To take this further, I'd love to see the addition of stats or some in-detail expanded multi-board at the end of the round. Big request, but the other newer castle fight is pushing it, and the map Direct Strike has all of these things already.
Very excited to see where this goes, and glad someone picked it up with some appropriate balance changes. Good luck on future updates!