I made it through all the game on hard, and geez, it IS hard. I was praying for a glitch or some way to cheat through.
Well... The story was kinda okay, the gameplay and the pixel art were the strong point. I enjoyed the gameplay a lot, it is good enough to make me forget my distaste of Necronator 2 (and it is a LOT). The pixel art was very satisfying and balanced on average for an immersive environment. However, the anime-ish art was out of context in there, it was good, but didn't match the pixel style nor the theme.
It was frustrating going through all the game and seeing that the Allies' army was almost the same as the Axis', not to mention all the pain and frustration I suffered to get there.
The point that most people complain (with a good reason) is that since the first Necronator, you have sold yourself to Armor Games and filled your games with ads and "premium content", and missed the point trying to get the same fanbase from the Infectonator series (or any at all). That is understandable, but it is still very unfortunate for the fans.
Altogether, it was really enjoyable, good gameplay and environment, just for the future, try minding the advertisement and the homogeneity of the art style.