[game-design] Consertar MiniGame JetRat (RatoaJato) #29 #30

[fegemo]

Corrige parcialmente #29 e #30. Precisei fazer alguns commits de ajuste:

• https://github.com/fegemo/cefet-games-meow-au/commit/8e73e4b65f2bcb4a6e4d24954491bdd4f316f2e1
• https://github.com/fegemo/cefet-games-meow-au/commit/dcbda73725ffd4b386a830fe1b6a6d258cef4fef