Thank you! There are just five levels: [2, 2], [3, 2], [4, 2], [4, 3], [5, 4]. I thought about making it longer or even endless, but I decided to make it much simpler because the game is for kids and the feeling of victory is important to them. That's why there are only 5 levels and confetti at the end. Sounds are taken from https://freesound.org.

The motivation was to create a simple educational game for my daughter. There are a ton of similar games, but all of them are with ads, premiums, and it is easy for a child to break them (e.g. by clicking some wrong button). The stack is simple - jQuery + jQuery Flip (plus simple js and css), no frameworks. The game was built in 3 evenings.