Had a lot of fun with this! The core gameplay loop is pretty addicting, and the mechanics work pretty well! I wish the player would speed up to their original position if they started falling behind though (maybe to counter-balance that, you could have the game accelerate more the further you get), and I never really felt the need to upgrade blocks since you can restock on them pretty easily by removing pre-placed ones.
Nonetheless, it's a really solid auto-runner ^^