Progression is horrible and the game is incredibly unbalanced in a lot of ways... However it's still a nice change from the generic clickers that plague the site. But most of it can be fixed by using an auto-clicker so 3/5 for not being generic.
Some things I wish were in the game:
[1] Buildings would be upgrades more frequently, rather than just adding more buildings whenever possible.
[2] AI wouldn't all run to the same resource. Total waste of time. Only one should run to an available resource while the others stay at a recreational area to gain xp.
[3] People would collect what they INTENDED to collect. It infuriates me when someone is going to collect some gold, and then a piece of dirt spawns and they take that instead, meanwhile the gold despawns.
@AmISure
Does your browser automatically clear your browser data when you close it? And are you making sure to click "Save"? If one of those is know, you might wanna fix that.
SUGGESTION: Sometimes I can't help but have to delete my cookies and cache and stuff, and I'm sure other people have this problem too. So how about having it so you can access the final test anytime during the game, so people who already know it or lost their data can skip all the lessons they already know.
@Shaakrahin
Yes, the semi-colon is technically optional, however MANY languages DO require you to use semi-colons no matter what, and it's just more easy to read if you do. Semi-colons are also required if you plan to put two statements on a single line, so basically, if you want to look more official, plan on learning another language or plan on putting more than one statement on a single line, then using semi-colons is suggested.
You're right about the += thing, it never said it was wrong, it just never accepted it as an answer, probably just an over-look in the making of the game, or just laziness.
Tricky difficult and up is just boring, it's just guessing where to go. There is NO strategizing at any point after normal mode, and there is really no point to keep playing once you get to it.