原文地址：

I like that Android allows (even recommends) that icons are not rounded rectangle. It can give your game some style. At first I thought about creating a special icon for the game, but I really, really like this shield with pixelated alien drone on it. And I have made this in Inkscape, so I can create any size I want (unlike some other graphics I created in Gimp). I'm presenting you the official Drone Invaders icon:

Powerups galore

Here's a video showing all the collectible powerups:

There's Atomic Bomb. I'm not sure about the name, maybe Nuke or Plutonium Bomb or Smart Bomb or something completely different. It damages everything on the screen. Bosses survive one or two, but 3 bombs destroy them too. Internally, each boss has 20 energy and bomb has 8 damage. Regular shot is 1 damage, until you upgrade lasers.

Second, there's 3-Way Shooting. You still lose one round of bullets for each 3-shot. This is a very powerful powerup as you can clean up waves and bosses just like that.

Third, there's Auto-Reload. As the name says, your lasers reload automatically, so you're free to shoot, shoot, shoot and shoot.

Fourth, there's Slowdown. It only slows down aliens, everything else moves normally. It's quite useless on first 20 waves, but gets really, really useful later.

Fifth, there's Double-Score. While this powerup lasts, all the points you earn are doubled. I'm still not sure if something will be awared for some point treshold, but it's still cool to beat the hiscore.

 

第17天：安卓图标、完成开机

正如我喜欢的那样，安卓允许（甚至是建议）使用非圆角矩形的图标。这样你的游戏可以有自己独特的风格。首先我想到的是为游戏设计一个特殊的图标，但是我真的真好喜欢这样一个盾牌上绘制一个像素画的外星人。同时我是使用Inkscape制作的，所以我可以使用任意我想要的尺寸（不像一些使用Gimap制作的图形）。下面是正式的入侵者图标：