Okay these right here well they are pretty neat and interesting. I do think they need a bit more details in a background, but as they are sprites you are showcasing to use, I understand why you stuck with the black background as that will make it easier to transfer over if any users wish to use them in their game. I think the detail and expressions in each character of PICO is nice and I would hope you'd still finish your game. There is always time, even if a short version where you toss him and see how far he goes, you know, something basic, it would always be a good addition and interesting to view. Don't give up on things you start, because I am liking what I see so far.
~~THINGS TO IMPROVE ON~~
You should make this into that game you wanted to make