Pretty fun, and simple. I love the idea of having a 2D challenge.
It was fairly easy and took me 5 minutes, but I thought it was simple and nice because it wasn't to long.
Though I was able to skip some levels by swimming, because the water doesn't kill you fast enough.
Also you can glitch through the 2D sometimes, but overall it's pretty fun. If you make anymore levels, I will try them out.