Death Assailant TD

This TD is very unique, even more so than station TD. This is exactly how it differs:

There are four different areas. The top three are linked to the bottom via teleport. The spawns come at eight spawn points, and there are ten players. The top middle area has four defenders because the evil creatures have a very linear path there, and an induvidual tower will get less kills than a one in the maze style area. The top left and right areas have bendy paths. If you are there, be sure to be wise about tower placement.
If a player leaves or is missing, the creatures that spawn for that player do not spawn. In the case of the middle, one side will spawn half the creatures that a full set of players.
I will put in the nice features everyone likes but is not really "needed", like camera smoothing.
There are different tower branches. A particularly long one is from basic tower-magic tower-cold tower. There is a tree of branches below.
Towers can do different secondary upgrades. Secondary upgrades have never been seen before in any TD. They are upgrades that can cost a lot of gold or just a little, depending on the tower. The basic types are Damage Upgrade, Speed Upgrade, and Area of Effect Upgrade. Some towers have special upgrades that the others do not. For example, the cold tower has the Ice Blast Upgrade, that allows an area of effect cold spill, but the colding is not as lengthy or slowing as the induvidual unit Cold Upgrade. Some towers are missing a basic upgrade because the missing upgrade(s) are virtually useless for that type of tower.
Lightning towers attack air only and have a low minimum damage and a high maximum damage.
Every upgrade can be upgraded more and more. The basic upgrades work in percents, giving a percent of extra damage, or a percent of extra attack speed. The special upgrades have set values because they are unique to that tower.
There are also a few traps that can be set on the monster path. These traps have no collision to the units walking by, so it is useless to maze. Traps are much more powerful than towers, but they are not activated as much, as they have a slow cooldown. Traps have their own upgrades, but usually not as much as towers.
Once you choose an upgrade path, the rest go away for that one tower, but for the other towers, the ability to have that upgrade stays. You can have a set of fast firing arrow towers, and a few high-damage ones in front of the fast-firing towers. If fully upgraded, towers are very devastating. I am still deciding on the maximum upgrade limit. 10 or 15 would be a good cap, but I can not decide which one to use.
The evil creatures come in levels, diffuculties, and waves. This is how it breaks down: there are 6 diffuculties: first timers (50% hp), a few downloads (75%), average (100%), your tenth time (150%), absolute elite (200%), you must be crazy (300%). The host decides the diffuculty. 5 levels per wave: wave 1 (100% hp), wave 2 (125%), wave 3 (150%), wave 4 (175%), wave 5 (200%). This is offset by the diffuculty. Example wave 3 in you tenth time diffucutly would be 225% of the normal wave 1 with average diffuculty health.
If the leak goes all the way, the end where the monster hit gets damaged is damaged, but the other ends are not. It is a good idea to protect the end that is getting leaked the most, as the path end has a limited ammount of health. In fact just 30 leaks in one place is a death. You can take about 239 leaks and still be standing in this style, but you can have as little as 30 leaks to die as well.
You can also build a command palace, that has some upgrades for more tower types.

Now for the tree:

......................................+Lightning Tower
......................................+Fire Tower
..................-Magic Tower+Ice Tower
Basic Tower-Cannon Tower
..................-Arrow Tower+Poison Tower

...............+Poison Trap
...............-Fire Trap
Basic Trap-Spike Trap
...............-Ice Trap

+Ice Blast
-Slowing
+Slow Poison
-Oil Spill
-Fire Scorch

-you need a palace +you need an advanced palace

Any questions, comments, and ideas are welcomed.