Really great game! Currently top 2%. Tho I only have two complaints/suggestions. 1. You have to leave the app on in order to collect more units. I appreciate the sleep mode function, but at the end of the day, it's a battery/phone burner. I'd love it there were an offline rng unit generation system just like the offline gold system. 2. Heroes seem to be very rare. It'd be nice to have some sort of way to collect them more frequently besides the gacha chest and the weekly (week-long wait) chest.