Gem requirement kills the fun – RAID HQ Review

Just started playing this game. Seems like a lot of fun but can't get to f without having to buy gems. The worst is you can do upgrades using coins but you can't save up enough coins without spending gems. If they want to make gems mandatory then make them mandatory don't tell me I can use coins for upgrades when I can't use coins for upgrades.
Review by Cab rider 99 on RAID HQ.