Really nice game and a nice idea! Some textures in the game are overlapping, and in the menu, there is no pressed or hover texture for the button, but even after this, the game was nice, and I had fun! :D
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Try to use Y-Sorting, it will help you with top-down style. The textures: https://imgur.com/a/yyWNGY1 .
+ Here is tutorial if you need: