@bakkart if it's the Ancestor's Treasure, you can sometimes skip building times with coins instead of gems, which also contributes to the total spent coins for the leaderboard.
Game is fun but has a lot of bugs... 1) Settings do not persist through game reload. 2) Critical hits only seem to apply to arrows and lasers (it would be useful to have that information if that is the intended behaviour). 3) Some information only updates after starting battle (e.g.: Increase Critical Hit Chance -> Go to Statistics -> Critical Hit Chance still has old value). 4) Sometimes I have to click twice to open/close options. 5) I always get twice as many rewards as described in Achievements. Is there any 2x rewards event I am unaware of?
How do critical hits work? I have about 40% crit chance, and when I activate "Show Damage Numbers" I always see similar numbers. I would expect 40% of the numbers to be about 150% since that is my critical hit damage multiplier.
For Google Chrome, it worked for me after installing this extension:
https://chrome.google.com/webstore/detail/ignore-x-frame-headers/gleekbfjekiniecknbkamfmkohkpodhe?hl=en-US
 "Tropical Merge"){kind=icon}
 "Grow Defense"){kind=icon}
 "Amorphous+"){kind=icon}
 "no-one has to die."){kind=icon}
 "Castlewars"){kind=icon}
 "Rotatix"){kind=icon}
 "GeoSketch"){kind=icon}