Interesting little game!
I unfortunately rage-quit due to the goalpost moving constantly. I am not sure the rest of the level design felt "rage"-y enough to make the goalpost moving feel fair.
Otherwise the level design felt good (I believe I made it to Level 3). Perhaps check the block detection on the player, as it sometimes felt like I died because the movement keys were still registering even though I was not fully on the next block yet.
Overall well done!
Edit: I thought of a solution for the goalpost. Perhaps make the animation a smooth "flying" animation when it moves and have it do so a little earlier than it does now. This would make it feel more fair, I believe...