Please elaborate

What is it ? Early access already purchase worthy ?
Yes it's EA and yes it's 100% purchase worthy.
The best way I could describe it is that it feels like a Complete Package (tm.). Like the devs have the craft & care to look at every element of design and infuse it with a level of polish & TLC that's incredibly admirable.
It comes across in every element you look at, whether it's the bright, colorful visuals, satisfying UI navigation & design, smart progression loop, "just right" power-curve, the butter-smooth game engine that they built from scratch (lightning-fast startup & load times on my HDD impressed). And much, much more.
One tiny example that explains it all. So one of the accessibility options is a toggle to change the Shift to sprint from hold-down to just tap once to keep running. There's no stamina meter so when you start you can sprint for as long as you want. Cool. But what I noticed was that when you stop by letting your finger off the WASD directional keys you still have a 2 second window to press back down on the directional keys to keep sprinting without having to hit the Shift key again. This is perfect if you get accidentally stopped by a terrain object or you're just picking up a loot item off the ground.
It's a small thing but the devs were thinking of character momentum & game flow when they coded that in. It's something I've never seen before and it really speaks to the level of fine-detail that they're operating from.
I'm over 75 hours in and have only uncovered about 25% of the map (though complete deforestation is part of my gameplay style, lol). Content updates are on a regular & consistent 2 week cycle, give or take.
It's a lighthearted take on zombie survival games with an inviting tone yet deceptively deep game systems. Balances arcade action & depth pretty darn well so it feels fresh but isn't "lite".
HIGHLY recommended.
(Been meaning to drop a Steam review, so I'll just use this.

)