Lohkous is a genre created by Hempuli, and this puzzle is of a currently unnamed variant created by dohz where areas can contain multiple clues. Here are the modified rules:

Hempuli's post has a rules graphic with an example puzzle that may be helpful in understanding the width and height constraints, although bear in mind that it covers the base Lohkous rules, not the variant where an area can contain multiple clues.

Theme: Free Space

L o h k o u s puzzle

Interactive solver at Penpa+