It's a pretty cool concept, and satisfying to see the zombies get pulled together to explode. I feel that the letter spawning could be tweaked a bit; I found myself spending a lot of time just running circles trying to find a specific letter.
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Yeah I had the same problem when play testing it. My plan is to add a 3d 'compass' to point in the general direction and area of the target letter - kind of like a hint, I guess but not directly to the letter. Glad you enjoying exploding zombies. It also needs tweaking (like a lot of things in the game), so that each zombie in the chain will have an explosion particle effect to 'enhance' the experience :)