Question: I got a more complicated version where you can alter your win chance, what do you think will it be more interesting for new users, or should I leave it as it is?
By this, you mean 0.01% to 98% win chance? The current version is unique (since I'm yet to find a dice site with solely 50% win chance), that's great, leave it as it is.
Problem: Created an account. Logged out. Tried to login but it's requiring me a password, I didn't set any because I can't see any "Settings" or "Set password" option, I just found out that it's in the deposit option

Can I still recover that account?