One of the initial design directions was to make it an endless survival, on the tower defense direction. But as you need too keep acting and picking and smashing, the loop didn't scale well. After some minutes, you would get overwhelmed by the amount of things to micromanage, so we decided to go a different way, more aligned to plants vs zombies, for example - shorter levels with specific threats to overcome. But your feedback is very interesting in that we should allow for more tactics to be viable, allowing for more strategic expression and playstyles.
We are sorry for the difficulty and the hard to discover revive mechanic.
Thanks for playing and for taking your time to write all the feedback o/