New Levels

• added 10 more levels (now has 20 levels);
• redone some existing levels to enforce use of the new move (dash).

Dash

• the race was replaced by a dash;
• dash advances 3 blocks;
• dash has a cooldown of 0.25 seconds.

Others

• by pressing "R" the level now restarts, in case you want to rethink the course or if you are somehow stuck (please send a comment with image if you are stuck/softblock);
• added a background music (I admit it's kinda bad), which should change in future updates.