Even though the game could use a little more polish in some areas, I found this game quite addictive, very well made and I often find myself playing it.
Here are a few pointers that I've gotten over the hours I've played it.
1- The maximum rank you can get is reached at 20 000. Which is too bad because you can easily reach 100 000 if you are familiar with the mechanics.
2- Distance doesn't matter at all if you're aiming for a high score. You only get 100 points every 50m and it doesn't scale with the combos unfortunately.
3- The points you get grow exponentially in relation to the combo. Which is why you must try to reach the highest combo possible for more points. It is better to get a combo of 100 once rather than getting a combo of 50 twice.
4- You start with 100hp and you will lose 10hp if you get hit. However, health regenerates gradually once you reach a certain combo. If your combo is 10 you will regenerate 1hp every 10 seconds or so. If your combo is 20 you get 2hp, and on and on. It doesn't seem like much but if you manage to reach a combo of about 100 you can fully restore your health if you can survive for a minute without getting hit.
5- So how can you not get hit? One critical move is the double jump. Jump, then swing, then jump. It allows you to bypass the harder areas without getting hit. By the way you cannot get hit if you jump above the game screen so you can use this as a stalling tactic for health regeneration.
6- Pressing down while jumping will let you use the "Holy Diver" technique. Which is the most overpowered move in the game. Is has I-frames during the whole animation and will instakill avery enemy in your path. Which makes it twice as powerfull as the normal swing.
7- Crouching is useless, however the back dash is quite usefull for I-frames, especially if combined with the holy diver technique for even more I-frames. you can practically be invulnerable if you combine these techniques properly.
8- Death will appear if you stay in the same zone for too long. THIS is what makes the game difficult and is a major pain in the ass. It means you have to be constantly on the move. After hours of playing I still don't know when its appearance is triggered but it basically is a game over. Death will instakill you even during I-frames or if you are above the game screen and you cannot outrun it.