There are in-game tooltips, and TD pros shouldn?t have to much trouble figuring things out, but I want to point out a few easy to miss things.
Summoner: Mage-like. thing in the middle, if he dies, you die.
Hate: Mob AIs are determined by the ?Hate? mechanic often found in MMORPG combat.
Note: Hate in this game uses an exponential decay formula.
Multiple-selections: You can double click a tower to select all towers of that type, or use the 1~4 keys. Doing so allows easier skill use, and fast skill learning.
Skill hotkeys: QWER (The tooltip might be wrong)
Tower AI: Tower AI can be modified. The ?Highest DPS? box is actually a dropdown menu, click to reveal all the options.