Have you ever played an indie game called "Thomas was Alone"? This game reminds me quite a bit of that. I love your artwork! It's really nice looking! I wish the controls were a bit tighter. There were several bits where I knew what to do, but any time I tried to do it I would end up flying off a ledge accidentally and have to rearrange all the blocks to try again.
Have more confidence in your work! So much of the tutorial felt like an apology, and I hadn't even decided what I thought of the game yet! Don't poison your player's opinion before they've seen it. Even if you think it sucks, present it with confidence!