I was kind of curious - did you ever consider this idea further at all? I find the game interesting and enjoy it quite a bit, but would absolutely love it if there were a way to play with a tool of choice - both because I think it would help to practice with some of the trickier tools and learn their behaviour more consistently, but also because playing single tool swap would finally give me a solid way to play Panel de Pon (which it's honestly kind of criminal there aren't a ton of games riffing off that idea, given that there hasn't been a new Puzzle League since the DS).
I’m working on a bigger version! (“working”, currently paused because life, but) here’s the link to the steam page!, LINK HERE SUPER CRANE HD
thanks so much for the interest!! I want to get on it back and just release it, so far its just going to be a bigger version, and haven’t been much motivated to clean it up for release