Purchasing any upgrade makes all upgrade costs go up and this becomes nearly impossible as the art upgrades cost the most. Buying the 300k image upgrade now made my level 2 skill jump to 600k when it was 20k prior. Makes progressing really hard and punishes you for unlocking upgrades and art. It's not just art either, any upgrade raises the price of all other upgrades. Can't even use the passives tab feature because prices are severely raised and it barely gets you any taps. Right now it costs 500mn to get to level 6 on the second one for a measly 17 taps LOL. Even if you cheese this, and save up points for a long time, you could go from a 3m image cost to a 14jz image cost. This makes no sense. Auto scaling prices, raising the value of every upgrade when you buy something, and punishing you for upgrading or buying images (which is the sole purpose of the game) makes it very unenjoyable. You're punishing the players for doing the only thing the game offers. Not to mention the late game upgrades make the game lag so bad that you can't tap anymore. That is very problematic. This isn't like other idle clicker games. I hope the feedback helps, but this is a bit much and I'll be uninstalling.
Edit: For anyone reading this is just for level 1 and there's 46 images to unlock. I'm stuck on level 4 with the next image costing more than numbers can go currently. No I'm not joking or exaggerating.