Optimize the grids aesthetically

[GrimPixel]

Puzzles with careful designs are compact and beautiful. Currently some puzzles like Chinese are not far from flashcards.
https://wikiless.org/wiki/Crosswords?lang=en

This program is probably the best crossword generator I can find. The flaw is it lacks this function: check the length of a word and arrange them compactly so there is not so many empty grids.

To realize that, the solution can be this: from a dictionary of tens of thousands of entries, the program select a word, then select the next word according to the last word's letters, repeat this till end.