These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Even Better Sequel: Hexagon is a good game, especially for one developed for a game development competition with a limited submission window. Its sequel puts the "Super" in Super Hexagon by having six stages, a better framerate, more music, and more fair mechanics.
Within Hexagoner, the rapid zig-zag pattern is an utter monster. If your timing is the least bit off, or if you overshoot the edge of the wall even a little ... *zap* Game. Over.
While Hexagon and Hexagoner are hard enough, Hexagonest is where the game really picks up. The "scroll" speed here is much faster, and the stage spins much more wildly, giving you less time to react than in the first two stages. The "rain" pattern here (a barrage of staggered wall layers) will most likely end your runs if you don't succumb to the fast convergence speeds or the faster triangle movement, and in Hyper Hexagonest, the spinning is up to eleven, and the double segmented spiral now turns at the middle. If "GAME. OVER." hasn't been drilled into your head yet, it will be when and if you complete this stage.