This is an excellent game! Nice use of assets and the core mechanic is spot on for the theme. Previous versions of yourself is very similar to how I interpreted the theme in my submission so I loved seeing that :]
I think this is such a well rounded and polished game its hard to find anything to say critique-wise. It has the right amount of speed and difficulty for exactly what its going for. I also noticed how on level 8 it seemed impossible to get to the top, or maybe I just don't know how to properly wall jump. That was a tricky mechanic for me to grasp.
I did however find a bug; by accidentally dashing right after I had touched one of my ghosts, and then pressing up quickly at the unlocked teleporter, my dead body was able to progress to the next level as normal. I thought it was super cool and a funny but maybe it's something worth looking at on your end if you're going for a real bug-free end product.