"A simple addition game"... This hurts a bit, but it is something that nobody mentioned until now, and it's an interesting subject for discussion. I was pondering about this a lot, so thank you for bringing it up.
This game is indeed more straightforward than Nonograms. I don't mind that, because some people struggle with the priority rules and math. Plus, I wanted to make an original game, not another Nonogram clone. I have ways of making the puzzles harder, and your suggestions are very close to what I have in mind. I intend to add new stuff soon.
There is also a way of making ambiguous which tile is correct. Check the following image. A and B are the same puzzles but they have different result. This brings the deduction aspect closer to Nonograms, but it would confuse and frustrate the players, as the correct answer should be only one. So, I intentionally removed anything like that from v1.7.
The game already has numbers that disorient the player. If the tiles can be ambiguous in a Nonogram fashion, then the game would be almost unplayable. CyphersGrids have a different fundamental philosophy as a game, compared to Nonograms.