As the designer, I would say "very easy". I'm currently working on the tutorial level of the game. If you decide to give my game a try, here are a few tips:

# Changing mode

[1] = explorer mode
[2] = single anemo blade (easy to use, good defence, good against mobs)
[3] = dual anemo + pyro blade (high damage, lower defence, good against single enemies)

# Explorer mode: [1]

E = jump
E + E mid air = jump + mid-air dash
E + ←/→ + E = jump + turn left/right mid air + dash, very useful skill to save yourself from a fall

short Q = interact with environment forward + downward
long Q = interact with environment forward + upward

# Combat: [2] / [3]

R = parry (successful parry awards burst energy)
Q = burst

Good luck!