There’s a guy who has above a 75% win rate on ascension 15 with all three characters, which doesn’t really support the theory that the game is particularly random. Particularly by the standards of a rogue-like. Sure, there are a handful of games that even perfect play can’t pull you through, but I’m pretty confident in saying that if you are still within the refund window you aren’t even remotely close to executing perfect play, and are probably attributing your defeats to luck rather than non-optimal decision making.
Not having a chance to win any % of games is unacceptable to some people, though, which I get.