Scratch my Back 0.25 is here!

List of changes and features:

- Added a tutorial level with united camera
- Added a second tutorial level with separated camera.
-  The regular level was redisigned, for players that already understand the game mechanics.
- Tutorial texts that appear and disappear from the heads of the players.
- Adjusted size for all enemies.
- Added a game mechanic that includes spawning enemies and platforms, responding to different game events.
- Changed the tiles from every single stage.
- Improved enemies AI.
- Added a coin-collection mechanic.
- Various bugs fixed.