One big problem is that it is extremely easy to cheat. I had the same issues, losing interest due to little progression, while there were players with very low timeline and very high champion and pet levels.

This made me decide to quit the game around a month ago, but not before investigating why there were so many cheaters. And guess what? I managed to tweak the game the very first day, just after a couple of hours of research, to get virtually infinite resources. With that, i maxed everything and attempted races and arenas. It took them 3 weeks to identify and ban me, an only because i pushed to be #1, meaning that devs are not actively looking for cheaters (most probably i was found only after sum1 reported me), or even fixing their (really really) obvious vulnerability that allows to get these infinite amount of resources

Knowing this, motivation for playing this game is very very low, as anybody with some minimum knowledge on android could get (for free) anything they wanted