Definitely Not a Platformer turns the standard platformer formula on its head to make a series of weird puzzles. You can leap right on the stage in front of you, follow a sign, or observe a safe road in front of you.
But things might go the other way. The game has 20 stages and they all modify the way you perceive the world around you. This encourages you to pay attention, try new things, and recall what happened before you can find the exit.

In many platform games, the terrain can help you figure out where to jump and how far apart the platforms are. With hidden paths and fake platforms, Definitely Not a Platformer goes against the grain.
There are times when you have to step into what looks like empty space, but a surface that looks solid makes your character fall. Instead of jumping without thinking, take it slow to get a feel for the ground. One failure can show you where a secret path is or help you figure out how the level works.
There are times when floors fall apart, colours change to show a new mechanism, and signs can lead you astray. Even the narrator can be wrong sometimes. Checking information is like putting together a puzzle: you have to tell the difference between useful hints and information that is meant to trick you.
Because the layout and challenges in each level are different, you shouldn't use the same strategy for all of them. Once you find the right path, you can reduce the number of deaths and finish the game faster. This adds another goal for people who want to finish the levels faster once they know how they work.
The speed of the game is more like slow inspection than crazy speed. The screen looks like an easy jumping game, but you have to check your surroundings every time before you jump.
You will fail a lot, and you'll need to learn how to use traps, fake gaps, and change the rules on the spot. To find the best way forward through this cycle of trying things out and failing, you need to be very focused, very analytical, and very patient.
The game also lets you move with Q/D on an AZERTY keyboard. There are left, right, and jump buttons on your phone's screen. You can also tap the play area to jump.
Definitely Not a Platformer is a fantastic pick for anyone who want to solve puzzles by watching and experimenting, especially if they want to learn how a seemingly difficult level is actually designed.