I think its dumb how you can unlock an upgrade for a tower but you have to wait until your overall level is high enough for you to actually upgrade it, if you have to wait it should tell you that it's unlocked when you reach the level that allows for it to be used
one thing i noticed is that you can win the game by just killing the Last Judgement gang and making the city safe again when the city's still infested with zombies...
one thing about this game that was very irritating for me is that the developer thinks that by putting god damn in a description somehow makes it more informative, honestly i find that it just makes him sound uneducated and ignorant.
half the time i do the challenges to do so many back rolls etc. i don't get the reward even though during the race it says that i completed it on the bar at the bottom of the screen, 4/5 if this is fixed 5/5
a few improvements that i would make if i were you would be to 1.make it so can make minions out of resources instead of shiny 2. after attacking if you successfully destroy your enemy and your monsters are still alive the ability to recollect them 3. queue for upgrades 4. ability to put multiple minions on one task to decrease required time. other than those few things this game is quite entertaining and it would be alot more entertaining if you could change those few things
i think that you should be able to go through airplanes, helicopters, etc. when bouncing up because i've had countless combos ended because i hit the bottom of a plane and was shot back down to the ground.