The popular choice would be Exit path, This is the only level and Achievement unlocked, all with multiple sequels if you like what you see.
All of the mentioned above are some of the best platformers on Armor Games, all made by John, so if you like his games check out his profile for more.
For a list of platformers to go through, scroll down on the main Armor Games page until you see a small box on the right labeled "Game tags" and click platformer, or click here.
My recommendation is you try a game called "Continuity", an unforgettable experience with a simple, yet unique concept that involves both platforming and puzzle-solving; Never frustratingly hard nor too easy, an enjoyable game with a relaxing and dynamic soundtrack and simple visuals.
