Make sure to spend your 7 SP in the 'level up 'menu before fighting!
Another player recently told me that the level up menu might not be intuitive to find, so make sure you are aware, haha
Putting 6 points in DEX will help you fight a bit more reliably. Another 6 when you level up might be reasonable too.
Sleeping during the 'Night' time slot heals for 80% HP!
I recommend fighting the chest mimic until you get a grasp of how EN works! Spend too much and you'll regen EN too slowly
Hope this helps!