Hey, i didn't play all the way through, but this seems like a pretty neat idea and a cool game, congrats that you managed to make this in one month, but i have some feedback:
1. First thing i noticed: You used an assetpack, which generally is nothing bad, but this is one of the most common asset packs used in many beginner tutorials for Unity. It doesn't matter if you can't draw and instead use an asset pack, but make sure that it isn't that obvious or maybe learn how to draw, that's what i'm currently trying to do also :). Also you can see the clear art style difference of the chest and the rest of the graphics.
2. The UI is well placed and clear to understand, but i personally think the font is a bit generic. And if you don't do that already, try to use Text Mesh Pro.
3. Later in the game the puzzles get more interesting and the different mechanics like stacking clones, different colored buttons or boxes are each well introduced, but especially the beginning of the game is a little bit lame. It's good that you didn't make it to difficult in the beginning, but at the start the levels are pretty repetitive for me personally.
4. This game needs a little bit more polish, e.g. when the box is pushed to the wall, you can't push it around anymore; the different art styles don't fit together; use a different button than ESC for restarting; and most importantly: Sounds or even music really would help the game.
I hope my feedback didn't come off as too harsh, but i saw in the description that you'd like to have feedback so i gave you some. I hope some or all of it helps you and it would be really cool if you could check out my latest game "Level Clear!" too. :D
Thanks for reading all the way through this and good luck with your future games!