Thanks for trying this stuff out. I could probably alter the pathfinder on the mouse snake to have a bias toward straight lines, since I think that's generally what people want to do.
The mazes are definitely meant to be a challenge, I actually have been experimenting with an even nastier algorithm for Level 1.
The magic shields need balance, for sure. I've found that they can be great in certain situations but 90% of the time they poof as soon as you pick them up. I may just add durability to them as well to take multiple hits. You're also right that the gold shield should be worth more.
Stealth is the opposite of Aggro, I'll explain them both. Aggro means that when there are multiple possible targets for a defender, they will always pick one with aggro (so if a defender has someone targeted and an aggro minion enters their range, they will switch to that minion). Stealth is exactly the opposite, so if there is ever any non-stealth minion available to target, the defender will not target the one with stealth.
I'll keep an eye out for the Shroomy issue, but I can't think of any way that could happen.
Thanks again!