I just finished Moss'd In Space by Rebecca Thorne. Picked because it had a happy cover and the ebook was available immediately while I waited for another TBR book to be available from my library.

The lightness of the cover carries through the book. There's dangerous space travel, smugglers, conflicts between alien species, but overall the challenges never seem insurmountable (at least not for more than a couple sentences). It's light without being pure bubblegum. Even the romance part is light with more of the focus on familial relationship and friendships. Sequel slated for next summer and I have added it to my TBR.