Starting off I had no idea what the goals were.

I wandered around and found the object in the upper-left. The "E" prompt is appreciated, more games need to have intuitive prompts instead of walls of text.

But then a menu came up asking me if I wanted to submit to a leaderboard? I clicked "No" but it showed me the leaderboard anyway. I'd criticize this because it doesn't seem necessary (especially right at the beginning of the game), didn't seem to function, and required me switching to mouse controls. In general, I think it's good to have your game/menu controls match and be consistent.

Going to the upper-right and I' say it's the same complaint. I'm already using keyboard to move, it'd be much better if I could use the keyboard to interact with the menu as well.

I played the space invaders game for a while, bought another machine that doesn't seem to do anything, and had to stop for now. I might check out more later.