PvP means you will be fighting other players to ace through the leaderboard rankings. However, I would say that it's majorly pay-to-win mode because people who have to spend on the game will have an advantage. Unless you are super lucky on the Gacha, you will need insane luck on Matrices to battle against those enemies. I did try PvP mode but couldn't progress much because of such a high bar. However, PvE modes like Bygone phantasm or the overworld modes, in general, are pretty doable, and you can progress at a steadier pace. I just finished wrapping Floor 100 of the Bygone phantasm, which has a total of 300 floors and didn't find it difficult at all. I'm sure I can progress more, but I'm currently focusing on upgrading my weapons.