Cool to see that it works also on another device
I'm not quite sure what happened in your round with the Tower puzzle, how exactly did it not accept your solution? Was the "Puzzles is solved!" popup missing? If this happens again, could you make a screenshot?
Yeah, my GitHub repository for this app is currently not very much known and has no watchers or stars, so when searching for "PocketBook" it appears somewhere very late on page 26 or so... It appears quite at the top when sorting by "Recently Updated".