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!

It's interesting how you can switch characters and stuff.

Unfortunately, I can't seem to get the blue one to platform properly. 'Tis the woes of jumping high, I suppose.