Thanks, I'm glad you're enjoying it. I wrote a solver on my PC which ensured all the puzzles are unique and work and at the same time it grades their difficulty. So there is a good learning curve I think.
Just for your own record, level 95 completely broke me! Took me 53 minutes to solve 😵💫
Ouch! I sometimes get stuck on the Switch version like that and it’s usually something obvious.