Really cool, level 5 is my achievement :) it made me want to do it again and improve my score!
btw, I love the minimalistic art of your game !
And like you said here, a tutorial would be perfect to help the player get into the game.
...Level 5 is actually the end... This is what I was most worried about. My game looks like a loop design with endless levels but it’s actually not. I don’t think many will reach the end credits because the game gives off the wrong impression.
Now working on some minor placements of the texts and imgs for the tutorial.