Well, that game's kind of a grinder. I don't really know how to use cheat engine so I couldn't find how to up the max hp value.
Instead, I found a technique to become powerful. It's grindy but it works:
-When you can get gold, get it.
-In a shop, buy whatever heals you (solid food is fine)
-I also bought some pure water in case an ennemy would require a skill to be killed (though I don't know any, it's also way more quicker)
-Grind the training ground unlimitedly to level up
-Become an HP tank
-Use wind blade when there are numerous ennemies and whatever you want for the rest, if your HPs are low, use the food, it doesn't count as an action in combat.
To save, use ESC menu.
The art is quite nice but it could certainly be better, with animation and with more content.
Also, the H scenes have nothing to do with the story at all, which is weird.
It's not bad but it's not that good either. 5/10