Past level 99, the counter starts using letters instead, example A0 to A9, after which it switches to the next following letter. This goes up to F9 and then the game goes to level 00, then it loops.
Standing next to a wall gives you a few important advantages. It lets you go even in trades when an enemy performs a jump attack on you. Because they rebound from the wall, you can actually land a hit and keep up with the fight. Some attacks will also push you back, preventing you from having a successful even trade. But because your back is against a wall, that is no longer the case.
With this strategy, having a few successful trades will always keep you ahead of your opponent, even if 80% of the fight is in even trades. You still need to react on time when hitting your opponent, it's just that this strategy makes it so you can relax and auto- pilot it for pretty much the entirety of it.
I wouldn't say I had fun with this one. It's probably the most boring game in the Supervision's library.
6