Yeah I am currently working on the balancing!
Everything needs a specific amount of the previous to unlock but it's way too much later on. And also like you said you beat it with half the time left so there's more balancing there too.
I did cap time expansion because it just started getting ridiculous, my ~algorithm isn't very smart yet so eventually the expansion got really crazy high. It should cap at 1000 exactly but I think I have a rounding error floating around in there somewhere ;)
But thank you so much for your feedback, like I said I'm focusing on balancing but I also am going to fix that rounding error based on what you pointed out!