update 7 : Boss,new enemis and Collision ,25/11/2018

There is a new update to : 

1. Add a new enemies type (his shot will follow you).

2. Bosses have now 2 part : 

when is life is above 50% he will shoot slow and big shot which follow you but he will not move.(these shoot deals 5x more damages)

when is life is below 50% he will stop shoot following shot  and start to move (only from left to right and right to left)

3. Review of a lot of problems in new collision detection.

4. now enemies in a room are now random.