Really cool idea! I enjoyed how you created the entire game in one level and caused issues based on things in the environment. I did have trouble getting the variables to stay in place, particularly with the Right/Left slots, but otherwise it was really fun to switch them out to get through the level.
At one point I accidentally mistook the 20 for a 0 and made my character constantly move left. I had just reached a new zone so I thought the gravity in the level had changed. Took me much longer than I'd like to admit to figure that one out.