But the design is so generic and dull. How does four boxes on a flat color background represent Swapnote at all?
I recommend searching up videos of Swapnote and try to at least emulate the gimmick of Swapnote rather than to get lazy with it.
As for the crusade stages, i looked up your Felix Fix-It Jr. stage and the placement/style is very identical to the official iOS app of that property. I compared them side by side and i see a lot of similarities. It looks like you moved/added/removed assets around with a little bit of shading. Even the door and windows are the exact same. Here's the photo i found and compared your stage to:
http://ww1.sinaimg.cn/large/58e3b90fjw1dyp5r5vpg3j.jpgIt looks ripped/edited