Ok, so correct me if I'm wrong, but the aim is that the player needs to stop the timer as close to the 00 time of each second shown on the countdown, right?
I was literally waiting for the 00:00 to press the button and wondering why the score was dropping massively. It's an interesting game design!
As this core game loop is skill based, I'd suggest make a screen recording of you playing and talking about the game and upload that to youtube and then link it in your page and in your tutorial section. That way you can keep your current game build.
It will help your new players get up to speed faster so they can really get into the complex modifier system you've designed.