I think this game can get frustrating when you don't know where to go next. An example is in the first area, Artaria, where a door that leads to the area boss is covered by the Spider crawl material. If you're looking at the map, it's not at all clear that this particular covering actually is moveable (even though the game featured one moveable horizontal platform of this material). Given how long it takes to navigate between areas, this trial and error process can get pretty frustrating.
Screenshots marked with 🍒 are created by syltefar and are considered public domain, free to use for anything. If you want to, you can note where you found it and link to this page.