I also had the issue with a weird scale but I fixed it by dragging the game to a 1080p monitor that is 16:9 instead of on my main 21:9 monitor which is 4k. I did have issues reading the text though cuz I couldn't fullscreen the game.
Issues aside I did enjoy the puzzles and using the entire mouse to solve problems was an interesting twist. I did feel that without the walkthrough some puzzles were hard to figure out, but I think that's just due to this being one of the first point-click puzzle game I've ever played, like once I saw the solution I though "ooh it's pretty obvious to match the colors with the rainbows".
All in all it was fun to interact with the puzzles