It's a small thing but... One of the puzzles is unbeatable. There's two number 4's in the middle square, it was the first puzzle it pulled up for me.
No I didn't put the other 4 there. It was already like that. It won't let me remove it... So I can't finish the puzzle.
6/10 for not particularly original, nothing new or exciting, et cetera. Good for one of your first few games though, it's nice to see people starting new hobbies and I wish you luck. :)