As someone who doesn't really like rogue-lite's, I found myself enjoying this game quite a lot. The constant playthrough's become less of a grind once you've grinded (the irony) enough cubes to start disabling certain implants and guns you don't like, meaning a higher chance of getting what you want and need sooner. The REALLY cool gun that you find parts for really isn't that special, and I only bought and used it twice, for less than a few seconds. I primarily played on classic difficulty, and the highest difficulty is only there if you like having your implants broken often. Arena mode is just a way to gather a few extra upgrades for your weapons and implants before it takes you right back to the normal mission structure - It's relatively difficult and time consuming from my experience, and the reward for the effort isn't really worth it. I don't really see it as a spoiler, but if you want the final boss to say something other than you're not perfect, I discovered on my final playthrough that you need to kill him in under 10 seconds or so - it doesn't change or affect the game in any way, but it was nice to hear after the same tired disappointing comment :)