Interesting. I'll see if I can replicate this and find what's going wrong. Also, I'm happy to announce I believe I've already fixed the issue of getting stuck on ice platforms, continuing the slam action when resetting to a checkpoint, and dashing in place while on the ground. I'm working on the glitching into ledges glitch now and will try to find this one afterwards.
Also, may I ask how far you got? Did you manage to get passed a few screens, or did these bugs prevent you from making much progress?