I know it's 2021 and Flash is dead but the game isn't quite idle for me anymore. I have to be watching the game for it to be doing anything. Not sure if it's just a new bug on the site's end.
From my understanding after playing a while:
*The goal is to make the cat grow. You can do this by filling up the yellow XP bar on the top left. You can fill up the bar by:
-Clicking the big "KNNK" ("Click") button at the bottom
-Collecting the yellow XP orbs
* The silver coins are the main currency. 1 Gold coin is equal to 500 silver coins. You can exchange them in the "baHk" button.
* Silver coins can buy the following, in order on the bottom of the screen:
+1 Silver coin per click
+1 Silver coin per second
+0.10 XP per click
+0.20 energy replenishment per second. This makes the green energy bar refill faster.
* The flower 8's do absolutely nothing since you can't actually collect them.
* The green lightning coin fills up the green energy bar.
* I have no idea what the envelopes in the bottom right menu do.
* I have no idea what the white bar below the green bar is for.
* Click on the arrow to open the backgrounds shop.
* The top right buttons are "Restart" and "Quit."
 "Dream Tower"){kind=icon}
 "Idle Breakout"){kind=icon}
 "Grow Kat"){kind=icon}
 "Supra Mayro Kratt"){kind=icon}
 "Sanic the Hedghag"){kind=icon}
 "Mini Dash"){kind=icon}
 "Knightmare Tower"){kind=icon}
 "Blow Things Up! 2"){kind=icon}