Mini update: New enemy type and some difficulty tweaks

Finally new enemy type is working how it's supposed to! Yellow rockets are rockets which trying to get to you as fast as possible and create big explosion with hope to get you. This type is a bit faster than red rockets but have slower turn rate, you can easily dodge them but they are very deadly if you get close. Yellow rockets spawn every 5 seconds and have default 10 second life time, so there will be ~2 yellow rockets every time on the screen. With the addition of new rocket type I decided to spawn red rockets every 1.75 seconds instead of 1.
Some animation been added, such as explosion particles for red rockets and large white circle explosion area for yellow rockets. At first I wanted to give yellow rocket some kind of area denial explosion, but this was very complicated for me and I decided to simply instantly show explosion and shrink it to 0 size. Working with the new type of rockets was an easy job, so i hope that I will add more types of rockets. Also my project slowly becomes spaghetti so at one time i should rewrite my project. But not today...

English language... Maybe I should read some schoolbooks to become better?