I must share this new test game I have just started. It's really different from all I have seen before and probably is geared towards training players to use gold and boosters right from the start.
Free starting boosters appeared after about 3 or 4 levels. Two free UFOs and the demo were added at level 13:
and two party poppers at level 17!
When I reopened the game the next day, I got the 2 UFOs again on my first level played. This was level 51, the start of the first episode race. There was no sign of a win streak in this game. (It usually starts at the same time as the episode race if I am not mistaken)
This is my inventory at level 59 (same as at level 51)