Xstal crafting via a building that you can build one of max would be a good addition. More fair if it produced fragments that could be collected when ready by clicking on the build when ready
Yes, make an update where theres craftable xtals maximum of 5 pieces needed to make one or whatever suits you, so you on your end won't lose. Its a win/win for you and the player's.(PS you got to make it rare to keep it awesome) but still I give this game a 5 star rating.