Hey thanks so much for your feedback—glad the difficulty curve felt good.
Yeah, I see what you mean. The check points are always placed as separate rooms between puzzles rooms to kind of break the rhythm and function as architectural interest. But I see your point. Will see if I get more feedback on this from others.
That gives me an idea, regarding the tutorial levels. Maybe if I overlaid some arrows and stuff, it would feel more like a tutorial so first-time players won't think the game is too easy.