Thanks for the feedback and playing the game! It will be balanced out in the future so that it doesn't feel too slow at the start or too fast at the end, it should feel satisfying as you progress from beginning to end in the future versions.
I play rebuild the universe well in that game you gain atoms and soon you are gaining 100 doudecillion atoms a sec so I decided that the first level on the campain at least give 1 billion Just makes the game faster and it helps you rebuild your army.
yeah, more content is coming in the next update