New Boss Stage and some balancing.

Hello everyone,

A short update:

- Stage 2-3 is now available. In this stage you will face the 2nd boss of the Game, the First Colonel! With this the 2nd Section of the game is completed. Only one more to go!

- The spawn rate of the platforms, their rotation and the player gravity have been slightly tweaked to try making the game easier to approach. Let me know if you can notice improvements!

Thanks again to all of those who have been giving a chance to my game!