Edit: given it is basically the same as the version I have, I do recommend this asset to anyone who wants to get a good start on a not so overly complicated take on 2.5d collisions and platforming 😀. Surely there are solutions with more features (such as ramps or multi collisions), but first you have to understand 2.5d (no easy task) with nicely commented code which this one has, and even then, more featured versions might be overkill for many projects. It is well worth the price for something that works and is quick to understand and apply.
Old comment: Would you please also add it to GMmarket? It is more convenient because it automatically loads into the libraries. I own the gms1.4 version, are there any new features or it ajusts the project to GMS2? Thanks in advance