Super hexagon is randomized but you can pickup the same types of 'shapes'. geometry dash is pretty much memory though.

also for me dark souls 2 scholar of the first sin, i dont pick up many difficult games but this was the only one i did choose to buy so compared to games like warframe, naruto, and mirrors edge its pretty difficult. still havent completed it. other than that tho i guess one finger death punch for me since its pretty fast paced and after a while your fingers give in