Bug fixed and improvements

Hello !

If you lost your progression, please use the cheat to go back where you were:
in the menu scene, press both triggers and both grips during 5 seconds. It will unlock all the levels and save your progression from where you choose to go.

Here are the changes:

- > I found that there was a big rendering issue with the trees in the bridge level -> bug fixed.
-> Smoother locomotion system, the is proportionnal to the finger position on the trackpad.
-> Changed the basic spell to move a block in puzzle block 3.
-> Changed the dark fireball explosion orientation.

Have fun !

Baptiste