I'll give my honest opinion despite receiving a free copy of Left Fore Dead: Zombie Battle Golf by a friend.

In its current state, I cannot leave a positive review, especially for the amount they are asking for the game.
If it was .99c maybe. (In my opinion a game should reflect the amount of effort that was put into its creation and it also should be compared to other games in a similar genre. This game for example falls in line with other golf games. There are other similar games, with 10x the content and dedication put into them that are sadly cheaper. Which is why I mention the price being my 1st concern.)

Pros.
Golf mechanics are goofy and funny.
You can beat up hordes of zombies.
Friends make games better so yay co-op.

Cons.
Terribly optimized. I have a 3080ti and this game still saw stutters and many frame drops.
There are no settings to lower the stutters or frame drops.
Settings are EXTREMELY limited.
Game is completed, this isn't early access even though that's what it should be.
Game doesn't feel completed.
Most Achievements are broken.
1 "Map" that slightly changes with each run. And its very slight.
Replay-ability is pretty limited in a game that requires it.
There's a hide mechanic that breaks if you are teleported while hiding.
The hide mechanic itself stops you making it a waste of time.
The game revolves around moving fast with slow movement.
Weapons hit registration doesn't connect half the time and sometimes when it does its later than the animation played.
The storm starts before 1st brain hit but the zombie horde doesn't (they should start at the same time).
Limited customization of your goofy-ish character.
No emotes but your character is constantly emoting, why not give us these to do ourselves.
No rewards for winning. No Progression at all.
Terrible connection to host issues. (I thought maybe this was just me and our host but others were reporting they had a ton of desync as well and we tried multiple hosts.)

Honestly, I could think of more but I think I've beaten the dead horse enough here...
Does the game have potential?
Yes.
Do I think that it will reach that potential?
No.
Don't waste your money.