Sometimes the zombies get stuck trying to catch a human within a really close distance, but not enough to catch them, you could increase the range of human capture by a little bit (a little bit bigger to the zombie collision box). Some SFX will also help, overall it is a good game concept, and maybe consider some kind of instructions or more detailed game description, at first I was kinda lost.
Just noticed a bug? I won both stage 1 and 2 without losing any lives, and when I press next stage it just sends me to the menu and only stage 1 and 2 are completed
Very nice game, love the gameplay. One small suggestion: show the amount of gold outside the turrets panel, so you can see it while upgrading towers and such
Nice graphics, thought you may need to adapt the game to smaller resolutions, because if I dont set the game to fullscreen I cant see the main menu buttons
 "Rogue Isles")
 "Idle Zombie Horde")
 "Hungry Little Black Hole")
 "Intrastellar")
 "Shooting Stars")
 "1v1 Pistol Combat")
 "Slime Murder Co.")
 "Warzone Sniper")
 "Is_This_Earth_2.0")
 "HARDEST GAME - FAST FLIGHT")
 "Iljos Adventures")
 "Split")
 "ScubaDive")
Thank you. We will have a look on it. :)