It is basically Pixel Puzzles Ultimate, but with better UI and less jigsaw puzzles to solve (currently around 600) of many different sizes and lots of varied images. If you like jigsaws and don't mind shelling out some money for them (in the form of DLC) it is a really solid pick for a game and it has some free puzzles so you can test it out if you like it first before buying more.
Works without any issues on Linux with Proton (tested form 8.0-2 on).