I think the most annoying thing about this game is when you hit something, and the "The x is damaged" thing comes up, blocking the top left view of the screen.
Might be a bug, not sure. iFinished building the car, just as Wave 33 started, then I decided to keep on killing zombies, and at one point I died. When I clicked "Retry", all the car parts were visibly scattered across the forest (Even though when I started to repair the car, it was at 8x%. Basically, the sprites of the car parts re-appeared.
Dammit, going for 4 stars in 1946, and about to win when I accidentally put one of my plane's powerup on booster, and the thing went off the screen and I can't get it back. :(
Definitely needs a 'Favourites' thing where you can quick-select between 2-3 buildings without having to go 'Build' -> 'Category' -> 'Room' -> 'Place'. Like having a small tab at the bottom where you can choose which 2-3 things to quick-select between.