It's simple, easy to play, and has a great idea behind it. The downside is that it's super short and bland. I see that you had a time limit, so I can understand the cons, but if you're trying to make a game that people are going to stick to and remember, try to put a little more time into it. Use this as a demo and try to build off this game, I'd love to see it become a great puzzle game :3