There are a number of URL params that you can use with the API - One of which is the limit param, which can be used to return more records. Without that param, it’s just returning the default limit.
Other params that can be used in the same way are:
page
search
order
how
There is some level of error handling on the API that will display the options available if you get the order value incorrect.
{
"errors": "Invalid order options. Order options must be one of ['total_cases', 'new_cases', 'total_recovered', 'total_deaths', 'new_deaths', 'active_cases', 'serious_critical', 'cases_per_mill_pop']",
"status": "failed"
}