Oh yes, there are plans to integrate Sentinel images as well, but the data fetch layer has to be worked on to handle auth/AWS config to fetch data from buckets.

So released with Landsat 8 first, and I think sentinel 2 has better resolution, up to 10m, if I am not wrong. So it'd be a lot better if Sentinel 2 integration were in-place.

There's also this, if you are interested in downloading timeseries as a whole: https://github.com/cmla/tsd

It supports sentinel 1/2/5p, landsat 8 and a few other satellites if you have the required API access identifiers. The idea is to fetch data not from buckets but from the actual sources, so the underlying philosophy is a bit different.

This is a gold mine, thanks for sharing!