Game is pretty much finished yeah, I think there's just like an extra dungeon or something that hasn't been added yet. Plot is fully complete though.
For anything you need to know, uh... Stick with easy mode, because normal mode is grindy as all hell and seems quite frankly unbalanced. Also, don't feel bad about cheating in money or casino tokens.
Besides that, just download the first game, then this one, and be sure to integrate them. Then, you can play through the entirety of game 1 and 2 as an uninterrupted story within game 2.
Cheat Engine. 4 byte exact value, higher or lower. Search for the value of tokens you stand to win or lose. Once you find it, set it to something super high like 9999999 then cash out. Congrats, you now have all the tokens you could need.