Lol.. still sounds like Cat and Mouse with Thors instead of Ultras to me.
Killing trees to make space is interesting... I suppose it's lot easier for the probes to cut down trees than the terran units (unless they use spell)
I'm not much of an items person so I don't see the need for Items in a Hide and Seek game. It's like putting level ups in a dodge game like in Run ling Run. Completely redundant and can only draw out the gameplay and make it boring. This is, of course, speaking from a design perspective, so I don't know, it may actually work in practice.
Another question is that with terran units, I'd assume their attacks have range. And if they do have range, how many hits does it take to kill the probe if it's not a 1 hit kill. If it's not a 1 hit kill, then it's really not a tag game. if it IS a 1 hit kill attack, then terran units shouldn't have range (again, unless they're using spells).