+Fixed an issue with selecting game difficulty from the menu.
+Fixed behavior of escorted ships and big bosses on levels 3, 5, 10, 14, 15.
(Now they should be in the right places.)
+Now the maximum frame rate is 60 (At a higher FPS could be observed problems)
+Fixed behavior of tr-crystals at low level of visual effects.
+General optimization of graphic files.
PS. Thank you for reporting bugs as well as for your reviews!
It's really important to me!