We'll see if we can add it, but basically since it's javascript, it's very easy to hack (which a lot of players do), so high scores will be pretty much useless anyway.
Yes, getting back after a reset takes too long. To get back to ~e4k where I am right now will probably take me a day, if not more. One idea would be something like "waypoints" every 5 improvements. So you would reset from ^17 to ^15, or from ^24 to ^20. That's still enough to replay.
Well.. Since active gameplay increases energy exponentially with each minute played (due to x2/x5/x20/... multipliers), any simple idle system makes it basically useless. So we had to make it somewhat complicated to be worthy. Just buy idle multiplier meta energy upgrade and leave the game idle for some time and see how the idle bonus energy accumulates, you probably don't have to read that whole page to see or understand how that works.
Interesting idea, but that's actually hidden mechanic (that balls spawn bubbles) that players have to figure out first :) Coloring the bubbles will give aways this too quick.
Sorry, we've just fixed that. It should now give you about e+4000, which should be a noticable speed up of reset.