This is much better than it was before. Going from level 19-20 is 406 clicks. The total number of clicks from level 1-20 is 4,087.
If you start adding more buttons, you might want to raise that 17 clicks up to 22-25 or maybe even higher. It depends how fast the other buttons give you gold.
The power % works better now. For it to go up, you need to click approximately 3 times every second. It doesn't fluctuate nearly as much as before.
When the Power % drops to 0%, it does not magically jump back to 100%, so that has been fixed.
Right now, the game is geared towards "active clicking" and less "idle".
When I tried the newest update, I played it like I usually play clicker games (continuous clicking, averaging 6-12 clicks/second). I bought the least expensive items everytime.
I click very fast and to get to level 20, it still took me 27 minutes. (somewhere between 9,720 - 19,440 total clicks, I didn't keep track) .
It would probably take an hour or more for a "regular player, 3-5 clicks/second", to get to level 20.
Most clicker games have small achievements (you have clicked 100 times, 1,000 times, etc), or atleast somewhere that you can see your "total clicks". Maybe even somewhere that shows your "Total playing time". Some people like challenging themselves, to see how fast they can click, or get to a certain level within a set amount of time.
In my opinion so far, if you like clicker games, where you are actually (Playing the game) and not just sitting there "watching it", even though there aren't many buttons yet, this game is getting more fun each update.