Attack of the Elemental

Is there a way to set the priority? BECAUSE THEY DON'T STAY FOCUSED ON THE ONES IN FRONT.

No bonus for sending waves early?

I'm going to be generous and assume the creator meant to make this a “puzzle”.

So in the normal TD games you have a few main types:
those that allow you to place towers anywhere
those that restrict tower placement
those with changeable upgrade paths
those with fixed upgrades

In all of those, you play and win. Maybe you are suboptimal, but for the most part you will eventually win.

But in this version, each level is a puzzle. You have to place towers and upgrade in an almost singular path to victory. There is (seemingly) no flexibility to winning here.
Now while that may seem “not a TD” maybe we need to think of it as a true “puzzle”.
Note that there are a few other TDs that at least have a few levels that are exactly like this, so it's not completely new.

This must be one of the most unforgiving games ever made!

I find that at the start of each location it tends to take several restarts to find the optimum initial selections to prevent an immediate leak. Which IMO kills the game for me right there. Nothing I hate worse than rework.