Geometry Dash
Although the creators are unlikely to notice, geometry dash is a fantastic game in general. The free version offers standard levels, while the full version's levels have variations like fingerdash and deadlocked. There are a lot more, too. The only thing I have to complain about is how difficult it seems to go on to the higher, harder, and meant to be easier stages after beating levels like clutterfunk and all of the free levels. In spite of the fact that the level you are playing on is not even an insane level. like blast processing and geometric dominator. While not classified as insane, those are challenging to do while moving from clutterfunk to one of those two stages. Electrodynamix ought to be given a demon level as well.