Most annoying features besides being pay to win: sometimes the battle loading just stops for no apparent reason meaning you lose your resources without even being able to participate in the fight. Buildings shouldn't require fuel to build, or if they do it should be a maximum of 200 fuel--having to pay 1,000 fuel to build something makes you have to choose between building your city and actually playing the game.
The most popular car, the one by HyperShadow9000, is very powerful. Slightly too powerful. If you get it, I suggest putting a roof over your head so you don't get KO'd in the face quite so often.
Dear diary: 20 days after the zombie apocalypse began and yet some greedy bastards are still just in it for a buck. I can't believe the used car dealership actually wants me to pay $200,000 for a car! Thankfully I met some guy who really enjoys watching me drive over zombies and pays me to smack them in the face with my car.
Suggestion: "Hide coins". I'm having trouble with the later levels because even though i've bought all the upgrades and no longer need coins, they still make up about a third of all the activity on the screen and that makes it hard for me to figure out what I need to shoot/what's shooting at me.
Is there a reason why you (designer) chose to make the fights a card-by-card activity where the player has to select the card to play on the board and then select it again during every fight and block during every fight instead of the more usual approach of selecting a card and then it auto-plays until it's destroyed? And vice versa, why do I have to block every single enemy attack? I don't understand why you went with this design decision.
I wish there was a way to turn off birds. I see movement headed towards my tower and panic and have to take attention away from gem matching to determine what the movement is, wasting time. Other than that solid game, shame it's so short.
It's too hard to tell which buildings are hostile and which ones are just set decorations. The game needs an auto-fire feature. The plane gets stuck in the wall if you fly too close to the edge of the screen.
If I have to keep the NPCs alive, I'd prefer if I could control their actions (eg ordering them to retreat or gather in a specific spot). Also, I think the difficulty levels of "challenge" and "hard" should be switched because after completing the challenges, the hard mode was a breeze.
Zone 4 boss suggestions:
Boss 1: Just keep him stunned as much as you can or find some way to remove Fate.
Boss 2: Stun him whenever he casts his ultimate (Omen), that way he takes 10x the normal damage and doesn't get to do any extra damage.
Boss 3: He'll heal himself for 2 million whenever you deal 10,000 dmg, so instead of killing him outright, get a skill like the guardian "subversion" spell that reverses healing and dmg, allowing him to kill himself.
Boss 4: Use a skill like the guardian skill "Disruption" that drains his focus, that way he can't use his full focus ultimate that lets him one-hit you.
Suggestions: make the HP/MP bars take up less of the screen. Make inventory easier to see. Make potions of the same type/size stack. Make total stats show up in a pop up instead of taking up half the screen. Add auto-travel.
Don't be afraid of dying in Darwin mode. It's not rogue-like, you won't lose your character, you'll just get all the exp/items you've earned during your time fighting monsters. I guess that makes sense; I mean, you're already undead, survival of the fittest doesn't really apply anymore does it.
You might need to re-roll a few times to get a better map. On the map that I won the medium badge with, in the 7x7 grid centered on the magic circle, I had 11 forests, 6 rocks, 5 water tiles, 2 mushroom forests, and a tree roots forest.
And why the rest is a huge drag?