Thanks for asking! I forgot to post feedback. I liked a lot of the stuff, but what I thought could be better: The numbers on top left. Could help if they had some visual clues (like icons, colours...) to set them apart. Now it's bunch of text and numbers, which I found was a bit difficult for me to tell the things apart.
For Units, you could have some short of sprite of the units that stacks up as the player buys more. Use like stacks of 5 or 10 maybe so the player can get an idea of how many they got based on the stacks.
Same kind of stuff with the resources: icons would be nice, and what I was thinking of was that you could add some sort of indicator when the collected resource is enough to do an ugprade so I dont have to browse the buildings constantly to check. So when the number of Booms is high enough to hire a Worker, the Worker icon / sprite would show up on the right side of it. Same with other upgrades the player can buy.
Thank you for the detailed feedback! I completely agree on the resource icons and it's something I'm planning to do... I just haven't drawn the icons just yet :D
Showing stacks of units in the Units section is an interesting idea but actually, don't you think showing an icon of the unit and its number would be better? Because I feel like if I only showed stacks of units, then you could argue that the game doesn't tell you EXACTLY how many units you have and it would lead to frustration.
I love the idea of showing whether you can buy an upgrade or not. I wrote down all of these ideas and I'll implement them. Thank you so much. :)