The Best of the Space Hole games (try the others to form an opinion though, they are cheap and the bundle is a good deal), and I would rate it around equal to Extreme Evolution (the one I like better flip flops, EE is probably a bit better but this is more accessible). This is a very unique marble game, rather then a liner set of stages you go through an interconnected map of stages, connected by portals. Gems are scattered across each level and collecting certain amounts of them will open up doorways to new levels. You are given several abilities (grow/shrink, reverse time, become a cube etc.) throughout the game, giving it a soft metroidvania feel - you are also able to find interesting tech with these abilities which might not be immediately obvious. The best ability is there from the start however, the ability to exit you ball and fly around freely as a marble, this is very fun and allows you to reach new areas and scout the level - however all gems and most portals can only be accessed with a ball, therein lies the challenge.

Outside of game play the aesthetic of the game is incredible and will immerse you in a almost completely abstract world, this game, above EE creates a vast diversity of environments that invoke various types of emotion. There are also some very memorable music tracks which augment this experience

In terms of story, where it is present it is very open to interpretation. I do feel however that this game manages to escape the disconnect I sometimes feel with competently abstract games, I guess it is the immersive world rather then a traditional story that carries it in this aspect. There is however an ending and I found it decently satisfying.

It is also worth noting that there are a few bonus toys that you eventually unlock, including a drawing tool with psychedelic filters, though far from the focus this is a fun distraction and welcome addition.