Here's my opinion on A20 after playing for 5 days. Keep in mind, I didn't pay attention to the changes during development, or follow notes, comments, etc...I wanted to experience it myself without knowing anything. That's just me....I don't follow any game like that. Besides, to be frank, I don't have time for it either. Anyhow...
1) First impression means alot and this stood true with all of the terrain improvements that were made. When I first loaded A20 it looked like an entirely new game visually thanks to all of the small intricate changes. Everything just looked much smoother and even the simple things like grass looks much better.
2) I really like the improvements to the RWG! While I still might use a 3rd party program later on in the future just for the sake of flexibility, I don't feel nearly as compelled to do so like I did before in previous versions where it was almost a must. Between the changes to the terrain, the RWG overhaul as whole, and more options.....I feel alot more confident in being able to a create a map I like using the built-in system.
3) New zombie models. This is kind of hit and miss for me, but def more hit than miss IMO. I freaking love the new skateboard dude! That's no doubt my favorite. He scared the living hell out of me the first time he peaked around the corner at me. Please don't change him. The cop looks alot better with more detailed belt accessories and a new old traditional "cop-ish like" colors as if they were there years ago when the apocalypse actually took place. I'm a bit indifferent on the new Z dog. Sometimes I like it better than before but other times I don't, so I don't know how I really feel about it. But maybe it'll grow on me in time. The new spider Z looks creepy as hell and MUCH better than Tom Clark on all fours. The new Wright doesn't do it for me.... I can't really point my finger on
why but I actually liked the older one better. Creepier maybe? I don't know? The same with the new lumberjack. He's not as intimidating as before even though he can take the same amount of beating. Don't get me wrong, I like the new look but it's much shorter than before and it doesn't really fit with the theme of the character like the older one does. When you think of stereotypical "lumberjacks" you think of big, strong, burly woodsman men and the size of the older one represented it much better than the new one does. If it were up to me I would use the new model with the same height as the older model. The Bears seem like alot smaller too and I'm not a big fan of that either but I could be wrong on this one (maybe it's just me). The nurse looks alot better with scrubs. She actually looks closer to modern times than she did before when she looked like she jumped straight out of a 1950s movie.
4) Sticking to changes to zombies. I like how all zombies can now randomly crawl but the transition animations are not very smooth. It's almost as if they teleport from standing to crawling. But I really like the idea of it though since it adds another element of surprise to the game. The mechanics just needs some fine-tuning is all.
5) Feral sense is by far my favorite new feature added to the game! PLEASE continue building on this aspect! I love it! I had no idea this was being added but as soon as I saw it and read the brief description I was so psyched that I set it to ALL and have only ever played it like this ever since. I keep trying to do a 1 life agility run (and I have to max it out before putting points into any other perk) and this has killed me so many times. I put points into knife/archer but I have yet to make it to day 5 on warrior with a 5 day BM. The other day I was on a REALLY good run for day 2.....found a nice temp roof to live on (motel 7?), a forge schematic, an extremely rare crucible schematic, and the trader had a workbench for sale. I was short of money to buy to the bench so I took a "clear funeral home job" and I thought it would be easy to do because it was one of the old POIs that I was very familiar with and man was I WRONG! Coincidentally I was instantly attacked by 3 ferals as soon I activated the quest and I only had a T2 knife, T1 club on me and I couldn't even run and leave the boundaries without failing the quest! Needless to say that was the end of that run. But I loved how it now keeps me on my toes.
6) Food/meds are now a REAL threat. I love this! I haven't experimented with farming enough to pass judgement yet but food seems like a real threat in early game whereas it wasn't before. I was in the middle of a separate agility run on day 2 or 3 (I don't remember) and my food was down to ~10% when nighttime was approaching and I had no more food. I was for sure going to start to die from starvation very soon and I was holed up in a FARM town at that! I did however notice earlier in the day that there were 2 boars in a field about 200M away in another POI and so I tried to take a chance to get meat and that was a bad idea to try with only a bow and knife

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Anyhow, these are just my initial thoughts. Keep up the good work guys. I can't wait to see what's next.