v 0.53 Fix some traps and add tip!

Several of my friends tried the game and easily flew through the first challenges and did not realize that they were challenges.

So we fixed it xD Now challenges are challenges!

• Now the first two traps are the inability to drive at speed, use Bird!
• We've added a hint banner before the first challenge to let players know the bird even exists
• Now, when you restart the level, the collected coins do not reappear, and the current score is not reset
• And a little bit increased view port of camera for better visibility