You can actually increase the amount of perk points received by 25% under "Ghost Tree". Also, "Technology Tree" reduces upgrade cost and duration. At the moment it is not possible to reduce Reincarnation time but we will consider that for a future release!
My suggestions for make the game better:
Make a better page for achievements.
Add upgrades for all the troops(Maybe we can buy these upgrades with Archangels).
Bigger screen for play:
if i click on "?" for infos,i cant read the Archangels information,and with a bigger screen we can see all the troops of our army for now you need to click "More"...
Add music and a mute button.
Try to think at new things like items/equipments that boost the income/speed,quests or bosses to kill.
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You can actually increase the amount of perk points received by 25% under "Ghost Tree". Also, "Technology Tree" reduces upgrade cost and duration. At the moment it is not possible to reduce Reincarnation time but we will consider that for a future release!