This is the hardest game in the genre I ever played. This is a solid 10/10 difficulty. It's very close in difficulty to IWBTG, maybe harder, due to pace and random nature of the levels.
I give 3.5 stars (4.5 stars for a good, well put game mechanics/sound/graphics, but -1 star for unforgiving difficulty).
I believe different color cubes shoudn't damage the player. Just not being collected was enough.
---Message for players who want to complete the game and get all medals---
To unlock the last level, it requires perfect runs of all previous levels (52 of them, for 4 orbs each, total 208). The last level itself has ALL previous hazards in a greater quantity and goes on for 50 sequences instead of 10. It's so unfair I believe more than half the time to beat the game will be spent at the last level.
If you wish to complete the game, it will bring you to your knees and beat you savagely with a blunt object. You have been warned.