I'm just into the second tier area. Glad the difficulty is finally ramping up. I only have a few issues with the game.
The general lack of transparency is kind of aggravating. Like I don't really know how the AI operates, which is usually very important to a wave defense kind of game.
The way you progress everything is also a bit weird. They give you access to Transform early on, but it seems like it can only get you green items until you upgrade it, which is somewhere far deeper into the skill tree.
I'm unclear on if the collection book is taking weapons, or weapon schematic at first glance.
What exactly affects my power level, and how does that affect my ability to kill enemies or varying power levels.
What the hell do I do with the like 5 stacks each of the green resources I have?
Not to mention just the general annoyance at how the menus are navigated.
Base defenses are boring overall. The fact that traps only affect one tile is pretty lame. You just end up building low walls to slow them down while you shoot them. I want some insane Deception/OMD! style trap setups.
Weird terrain blocks you from building better looking structures sometimes. Wish you could terraform to some degree in these instances.
Leveled up snipers and pistols not one shotting normal zombies with headshots is aggravating. It makes them very inefficient.
Skill cooldowns are awfully long. Only getting one airstrike per defense is pretty lame. The supply drop is incredibly underwhelming. 5 minutes for 90 wood, brick and metal? What a waste.