Overall, very good.
Place a Tower: I'd specify that the locations are the black corners of the tiles.
Typo: "Towers starts..."
Rotate a Tile: I assume you can rotate fewer than the maximum tiles.
Upgrade any Tower: The "Once" seems superfluous and if anything, confusing.
The sentence about if you have two actions isn't really needed since you specify above that you can take the same action twice in the two-player game. (I assume that is the only way to have two actions?) In fact, as-is it's a little confusing that it mentions having two actions.
I assume the ANY is to indicate any player's tower. That should be spelled out in the description.
Similarly, the process of changing the die face should be stated as how you physically do the upgrade.
Trade Resources: I'd prefer "any time" with a space. Are there any restrictions on trades, for example, can one player just give their resources to another player?
Move Phase: Typo: "attemp[t]"
Monster Movement: Typo "determin[e]s [the] number..."
It's weird that it says the number varies, but they're all 6.