Putting a flat time to full regen in itself isn't a bad idea. But imo, 10min, 20min, and 30 min are way too long. The game isn't fun anymore. It's either just go and die, or sit for several minutes and just wait. Really tapping into the idle genre here.
Playing in FireFox, if I fullscreen the game all I get is a black screen (if I'm in a match it gives me the background, but just that). And when I hit escape to exit fullscreen the screen continues to be black, but with the TOS and social links at the bottom visible. (Or from in a match it also just goes to a blank black screen.)
 "AstroLight"){kind=icon}
 "Idle RPG"){kind=icon}
 "Shamaniac"){kind=icon}
 "War of Omens"){kind=icon}
 "Runean idle"){kind=icon}
 "Escape From 26"){kind=icon}
 "Words and Physics"){kind=icon}
 "Kitt's Kingdom"){kind=icon}
 "My Pet Protector 3"){kind=icon}
 "Level Up!"){kind=icon}
 "GeoSketch"){kind=icon}