v1.2.0

I've reworked the select screen which now shows a level preview and allows the user to set a difficulty. It also looks much nicer than before.
I've also added Challenges to the endless mode to give it a bit off purpose.

You can now optain 3 stars in the game which will be displayed in the title screen.
1. Complete all levels

2. Complete all difficulties in the select screen (for each level)

3. Complete the challenges in endless mode

Lastly I've increased the amount of difficulty for completion one level in endless.
Difficultly now caps out at level 50