Chasm for me was a blast .. For the first playthrough at least. Great gameplay, enemies and combat. Really cool use of abilities and the need to come back to certain levels. Boss mechanics were great and the platforming was thoroughly enjoyable. Overall gameplay was 9/10
Don't have a clue what the random seed does as my three playthroughs were almost identical and made the game, what i thought would be more enjoyable, just the same dull corridors. Enjoyed 100%ing this either way