Hello,
What do you mean by “high tiers don’t appear”? When you hit 5/5 on a skill?
Come over to Discord for better interaction.
For saving, you need to click outside the game window, because I don’t want to save data every time you get a currency or an achievement — it could cause performance issues.
I noticed the same issue with the web version in that there are upgrades that are bugged:
This isn't the same case in the downloadable version:
Okay, I messed up the cost because I changed the upgrade logic — I’ll fix it ASAP.