Right now, "net profit / loss" in the income statement doesn't match with the "retained earnings..." in the balance sheet.
That's because the world starts with 200.000 usd of own capital...
It'd be nice to separate those 2 items leaving equity with two lines:
One named "Capital", "Stocks", "Common stocks" (or whatever), with the initial money invested by the owner (200.000 in the case of the last world).
The other remains "retained earnings..." that should match the summation of all "net profit / loss" in the income statement.