Interesting idea, I liked it. The task of finding the required shape looks easy at first, but it gets harder as you go. Also, different bonuses as secrets is a good idea.
What I'd like to suggest for improvement - please increase the size of the game window. Because it's very small and makes playing difficult :( Also maybe you can add some levels or win condition, because endless finding is a bit boring.
Overall it's a good game! I also appreciate if you play and rate mine.