Well done
The game was well made, the towers were easy to understand, no pathing problems, and overall a fun game. Very replayable. Hard enough to keep me interested, but not so impossible that I couldn't get farther with each attempt. The only reason I can't give it a 10/10 is that it didn't take the tower defense genre any further that had already been done many times before. I would love to see a Z-Wars part 2 with the same solid gameplay and some more innovation.
Nothing too special
Basically it's another generic defense game. Overall, it wasn't that bad considering what it was. However, you could easily make it better.
First off, make the upgrades, well, make more sense. The basic tower costs too much for what you get, and the lightening tower you get mad bang for your buck. Try to even those things out. It's frustrating spending a lot to upgrade a tower and still have it suck.
The terrain could also be improved. Try adding in random blocks for levels of sorts, or even a random level generator. While you're at it, you could add levels with certain goals, or keep it in a sandbox style (or both).
This has a lot of potential, and I hope you keep working on it.
Nice tower defence
The gameplay was actually quite smooth, and there are some cool original ideas like the walls and the ability to relocate the towers. I don't agree that this is just another one. The fact that you have to guide the enemies along your defence, gives an extra challenge.
And that's also the problem. The beginning is confusing, as you have no idea about how the different enemies chose their path. There is also no way to influence the way the towers fire, which is a bit annoying in this setting. As mentioned by others, they inherently pick the first one, which makes them very inefficient at times.
Also the money gain is very slow. It would be nice if you could get a bonus if you call for the next wave before the timer runs out for example. As it is now, the game is pretty hard, and requires some devotion to get used to it. A bit more guidance or an easier mode to learn would be nice.
Good game
It was fun, but after I hit level 25 I just kinda stopped...
eh. needs polishing
Would be great if it was polished graphically. the art was a bit bleh and when a tank is destroyed it just disapears. they should at least explode or something. the reason why it has such a high score as of 8 is because of the wide variety of towers which is rare in defence games nowa days.