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Update 29.02.2020

You have to replace select( 'core/editor' ).getBlocks() with select( 'core/block-editor' ).getBlocks() in order for this to work

This worked for me:

const { registerPlugin } = wp.plugins;
const { PluginPrePublishPanel } = wp.editPost;
const { select, dispatch } = wp.data;
const { count } = wp.wordcount;
const { serialize } = wp.blocks;
const { PanelBody } = wp.components;

const PrePublishCheckList = () => {
    let lockPost = false;

    // Get the WordCount
    const blocks = select( 'core/block-editor' ).getBlocks();
    const wordCount = count( serialize( blocks ), 'words' );
    let wordCountMessage = `${wordCount}`;
    if ( wordCount < 500 ) {
        lockPost = true;
        wordCountMessage += ` - Minimum of 500 required.`;
    }

    // Get the cats
    const cats = select( 'core/editor' ).getEditedPostAttribute( 'categories' );
    let catsMessage = 'Set';
    if ( ! cats.length ) {
        lockPost = true;
        catsMessage = 'Missing';
    } else {
        // Check that the cat is not uncategorized - this assumes that the ID of Uncategorized is 1, which it would be for most installs.
        if ( cats.length === 1 && cats[0] === 1 ) {
            lockPost = true;
            catsMessage = 'Cannot use Uncategorized';
        }
    }

    // Get the tags
    const tags = select( 'core/editor' ).getEditedPostAttribute( 'tags' );
    let tagsMessage = 'Set';
    if ( tags.length < 3 || tags.length > 5 ) {
        lockPost = true;
        tagsMessage = 'Required 3 - 5 tags';
    }

    // Get the featured image
    const featuredImageID = select( 'core/editor' ).getEditedPostAttribute( 'featured_media' );
    let featuredImage = 'Set';

    if ( featuredImageID === 0 ) {
        lockPost = true;
        featuredImage = 'Not Set';
    }

    // Do we need to lock the post?
    if ( lockPost === true ) {
        dispatch( 'core/editor' ).lockPostSaving();
    } else {
        dispatch( 'core/editor' ).unlockPostSaving();
    }
    return (
        <PluginPrePublishPanel title={ 'Publish Checklist' }>
            <p><b>Word Count:</b> { wordCountMessage }</p>
            <p><b>Categories:</b> { catsMessage }</p>
            <p><b>Tags:</b> { tagsMessage }</p>
            <p><b>Featured Image:</b> { featuredImage }</p>
        </PluginPrePublishPanel>
    )
};

registerPlugin( 'pre-publish-checklist', { render: PrePublishCheckList } );