This was a fun, straight forward game to play! I like simple games and what you have here does exactly what's on the box.
There aren't too many complaints about the implementation, everything is laid out simply and there's not too much to be confused about. My suggestion is for you to try to scale a simple design like this towards the end of the dev cycle. Once you figure out a game loop, the challenge becomes creating content with your mechanics. For example, it's possible to create different levels with various level sizes, layouts, and time restrictions to add diversity.
Keep up the good work! I hope you stick with Game-A-Week!