Well, it doesn't have to show the exact number, but it would be helpful if a failed attempt got more feedback. That could be a progress bar or something like that. Usually, puzzle games have that unless it is clear from the set-up how far you were falling short of the goal (like in Angry Birds).
Well, the graphics all look okay-ish, but not professional. In particular, the characters are a bit messy. I like the graphical effects of the wizard tunneling through walls, but the character design itself of all characters looks improvised. To a lesser extent that is also true to the level elements. Finally, the whole background, grid, text elements etc. could also be beautified. I am not good at such things either, but maybe you find a graphic specialist who can help with your project, because it's always a pity when a great idea for a puzzle game flops because it doesn't look pretty enough. (People will buy/download based on looks, mostly.)