I got stuck on Wave 70 – the grow-when-shot boss just wouldn’t die. I think it is a bug. At first the boss grew when I shot it, but after a while it didn’t change, and always stayed the same size and pinky-purple colored. I kept shooting it for 3 to 5 minutes and it still didn’t die, though none of the previous bosses took longer than 40 seconds to defeat. All the while, the boss kept dropping minions, which I was able to kill normally. I could only just see that when I shot the boss, a “10” points indicator floated up from the boss, partially cut off by the top of the screen. I’m on a Samsung Galaxy Nexus.
Also, I lost my progress in the game when I tried to change Settings in the middle of the game. This was because of a UI problem. The pause screen has buttons at the bottom for “Exit game”, “Settings”, and “Continue current game”. After continuing to the Settings screen and looking it over, I pressed the bottom-left button with the left-facing arrow. But that turned out to be the “Main menu” button, which dropped me out of the game completely, making me lose my progress. (Luckily, I didn’t mind too much in that game, since I couldn’t progress past level 70 anyway.) I see that if I press my phone’s Back button instead, I can return to the pause screen and then press Resume – but there should be an explicit button for this too. I think the best fix for this is to replace the “Main menu” button with a “Back to pause screen” button if you got to the Settings screen from a pause screen.
I also noticed that I can’t press the Reload button while my other finger is still touching the screen just after shooting a bullet. That is, multitouch doesn’t work. It is a little annoying to have to stop shooting completely to reload. But then again, having to reload manually at all is also annoying, and it’s part of the game, so you could call this behavior a feature, since it makes reloading harder.
Finally, I was a bit confused about the name of your game when I read your blog on my phone, since the Play Store link ends with “com.bigosaur.backyardpanic”. Maybe it’s too late now, but it would be less confusing to change your app’s package name to “com.bigosaur.droneinvaders”.
Apart from those problems, your game seems like a fine phone game, with enough gameplay elements to make it interesting. Having to manually reload is not as bad as it could be, since you give feedback that you are out of ammo and have to reload from multiple sources – flashing Reload button, missing ammo bar, small “Out of Ammo” white text, and click-click sound effect. And it’s impressive that this game was put together in so short a time.