Thank you for playing !
Yes, a day or two after submitting, I did felt like adding extra indications at the beginning could have served the game better but I didn't wanted to be the kind of dev that literally hold your hands throughout the game with invasive tutorials, so I didn't explain everything, thinking that players would figure it out while playing, that's clearly on my part (I'll do better next time on this specific section).
The terrain/biome changes every 5 levels, but yeah not much in terms of gameplay difference then again I've put the emphasis on the blocks mechanics.
Maybe I'll comeback to this game, I don't know I am kinda busy with other games projects :)