Really nice game! I liked the art style and the music was amazing. The game itself was very fun and I enjoyed the different levels. I did find the number 30. Overall a very fun and enjoyable game :D
I don't know if you've heard of Game Development World Championship before (gdwc2019) but it's a competition for indie game developers where they can submit their games and it's free! It's great if you want some more visibility for the game and it only takes a couple of minutes to join :)