Which Shop upgrades should you prioritise?

[Chrono]

Question's in the title

Basically, I just want to know which upgrades in the shop I should focus on, or should I just spread it across multiple upgrades, i.e. should I buy the increased IP gain for example from the souls gotten from achievements and daily rewards

[Kyouko Tsukino]

The upgrades are mostly worthless. A 3% or 5% increase will do nothing for things that have, through progression, upgrades that give it buffs that need scientific notation to display.

The only one that may be worth considering if you're in a hurry later on would be the Time Flux rate one, but even that's only really useful by a point in the game where you'll be done playing.

[Chrono]

Yeah I thought that - they're negligible at best

The only one that seems somewhat useful is the IP gain increase, just because of the eternity resets - but it quickly becomes useless again

Seems a bit odd that the main form of monetisation is functionally useless though

[Kyouko Tsukino]

The main monetization seems to be cosmetics... Because impressionable gamers just can't help but buy some "dragon eye" or "hamster wheel" reskin for a thing that they'll only be looking at for about 5% of their playing time, if they even look at it that much.