Hello! American here. Tried the game. I was able to understand the working times, optimize living space and transport, invest savings, and improve my job level. I was able to see the account balances change, and see that they added up together. I didn't know how to determine likely investment returns so I mostly invested in the cheapest option that wasn't a bank account. I could see it had varying returns, which is realistic.
I didn't understand the FIRE instruction (or interface?) in the "Job and Pension" tab. The only option seemed to be a bank that I didn't have money in, and it appeared to only offer a 1% return. Instead, at the age I thought I had enough to retire, I set a negative investment in my investment account. Sorry I didn't understand that part! However, the monthly investment withdrawal worked.
Interestingly, the age at which I thought I reached FIRE was 47, was very close to when I FIRED in real life.
The medical messages very funny. "attack of hirsuteness..." "one day you woke up without a soul. 8000 euro to buy a new one."
The amount of money I had in the game at 47 was enough to cover my expenses of the time at about a 3.7% withdrawal rate. In the game, the variable investment returns were less than that, apparently, and I ran out of money at age 87. Instead of declaring bankruptcy, the game allowed me to resume my career immediately at full pay!
I hope that in my own ongoing FIRE, I manage to keep my soul. :)
