I think it's going to really frustrate most people who try this that you didn't put an explanation of the controls and gameplay anywhere. Not a blurb on the Itch page, not on screen in game, nothing (there's nothing at the time I'm writing this, anyhow). So the first thing I have to do is press all the keys on my keyboard and click around with the mouse to figure out what does anything, and even then I don't have any Idea what the little meter above the box means, or what I'm supposed to do to really play the game.
You did a lot of work to implement this! It's a major bummer that you're gonna let most people get too frustrated to even give your game a real try by not going a few extra steps to make it clear what the game is about.