Metroidvanias can be classifies in terms of how linear they are. (This isn't the only axis that can be used for this purpose; there's other factors, like melee versus ranged combat, or the presence or absenceof RPG elements like levels and XP) that separate them, but for purpose of this post, the linearity is what's most important here.)
Dust: An Elysian Tail, as mentioned earlier, is one of the more linear ones, with optional backtracking. It does have RPG elements. My one issue with the game, other than the fact that it fails to sustain its difficulty (a common problem with Metroidvanias with RPG elements; even the famous Castlevania: Symphony of the Night suffers from this big time), is that cutscene skipping is only partially implemented (can't skip before dialog appears, and some cutscenes, most notably the opening, can't be skipped at all).
Guacamelee is a nother linear-with-optional-backtracking metroidvania, this time focused on melee combat (including the ability to throw enemies) and without RPG elements. Some of the platforming can get difficult, and there are many moves thar require pressing multiple buttons simultaneously that are required for platforming. This is the sort of game where you pretty much *need* a game controller to play comfortably; playing with a keyboard might be possible, but only if that keyboard doesn't have an issue with lots of simultaneous key presses.
Unepic is another linear one, this time *with* RPG elements. (Interestingly, some of the spells in that game are the sort you sometimes find in WRPGs, but pretty much never see in JRPGs, which gives the game an interesting feel; it also satisfies "linear warriors, quadratic wizards".) The final stage has a bit of a genre change that is somewhat controversial, however.
Timespinner is mostly linear (with some optional side quests), though there is one part where, on a first playthrough, you are very likely to get stuck and not know where to go next. It does have RPG elements. Of the games on GOG, it is the most similar to the Castlevania games that the "Metroidvania" term comes from.
Hollow Knight, to my understanding, is significantly less linear; it is also more likely that you will be stuck not knowing where to go. La-Mulana and its sequel are even worse in terms of not knowing what to do next; I would actually consider La-Mulana to be a rather hard adventure game disguised as a metroidvania. (La-Mulana actually reminded me of Wizardry 4, another hard adventure game disguised as a different genre.)
(Is there any Metroidvania here that focuses on ranged combat, like the Metroid series does?)
ChrisGamer300: I play Hollow Knight, La Mulana 1, The Messenger and Shovel Knight which are all good so i would recommend them.
Don't know about The Messenger, but as for the other games:
* Hollow Knight and La Mulana are not good choices if you're worried about not knowing where to go next.
* Shovel Knight is not a metroidvania; it's structurally most similar to the Mega Man games (self-contained linear platforming levels with one item to find in each level, no reason to backtrack unless you missed something, and there's choices as to the order in which you play the levels).