Update: UI improvements and fixes

You can improve your castle using skill point, you get 1 point for each level up, you can increase damage, number, speed and size of the arrows.

You now have 1 skill point at the start of each game, instead of 0.

The user interface that allows the improvement of the castle has been improved, you can use it more easily and quickly.

You can now change the cursor size.

Some bugs have been fixed.