I found it surprisingly generous with memory upgrades compared to the other games by these folks, though I got boosted from 30 to 50 gems after that day 1 update while others are saying their gems were removed? I assumed it was apology gems for implementing the perfect bonus late. Anyway, with those and extra gems for 3-hearting levels (if you didn't notice, you get bonus points for consecutive shots that actually match, so don't lob singles at that one web-orb on the map if you can instead clear the orbs around it, lone web-orbs pop) I was able to get space for all the current girls.