If I know my math(I don't, I asked chatgpt), reaching 100% of leaving the observable universe should potentially take around 5 months, in the state the game is currently in (Due to there being no speed penalty for going over the energy usage)
I'm not sure the "Lemon Duplication" works. I've tested by buying it after my combo is maxed out in the garden and seen my gains not change visually, nor on direct-clicks, even as it's supposed to be increasing.
Also, the Tech Store in late-game levels is a massive frame-rate lag. The Particle Settings needs to also account for the item-fragments, they're the major source of lag. Hitting a boom causes a section-long freeze.
About as good at any game this dude makes, sounds like. And the prestige mechanic is going to suck at give diminishing rewards over time and just feel like trash.
In case you ever update the game