There is an artifact which gives a chance to skip 1-10 levels after a bossfight. (maximum is 50% chance to skip 1-10 levels every bossfight till 90% of your maxlevel)
The amount of pixels we get at high levels of fighting is too low, I think the amount you get per level should be increased at a higher rate when you reach high levels, as it becomes very very time consuming to try and grind for just 1 upgrade.
You should add either a capped speed in Hatchery, or once you reach 2 seconds on everything, you can continue buying speed, buy it'll take the total time down by very small amounts.
Have you thought about making those things you can purchase on bosses (like stopping health regen or half damage) permanent buffs instead of just 1 time purchases?
I had a weird glitch where I came back after closing the browser for a couple hours: all of my crop gold per collecting were severely lowered and they only began returning (in very small increments) after collecting them several times.
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 "Pacifish"){kind=icon}
 "Idle Breakout"){kind=icon}
 "Idle Harvest"){kind=icon}
There is an artifact which gives a chance to skip 1-10 levels after a bossfight. (maximum is 50% chance to skip 1-10 levels every bossfight till 90% of your maxlevel)