I don't know if this is intentional, but I found that moving around the world required using the shrink/grow to either gain more height or phase through platforms. I think there is a good foundation here, especially as the shrink mechanic seems really cool, but I personally couldn't figure out exactly what I was supposed to do. The fangs didn't seem to do anything once collected and the (teardrops?) didn't appear collectable. 

I loved the art and the music! It's super impressive you did all of this yourself for your first time, ours took a lot of people working together and I can't imagine how hard you worked to get this much by yourself. I felt like I needed a bit more guidance in what to do but I feel like you've got a good core beginning.