I liked the color scheme for this game, think it would look visually pleasing when fleshed out.
Took me a while to figure out how to play the game. Intuitively, I kept expecting to move the player with WASD, But after that, it was straightforward how the game should be played.
Perhaps there was no need to place the tiles so far up, such that you needed to scroll to see it. Maybe a canvas layer overlay, with UI to select the pieces would help! This way you can remove the need to the WASD to move the camera.