A bit on the easy side since all obstacles can be destroyed and level-ups are easy to come by early on. The only enemies I couldn't one-shot by the time I entered their rooms were the thunderclouds, and that was because all of my magic passed right under them instead of hitting.
Some things I noted:
*You can see the thundercloud's eyes through walls, such as the camerabot room with all the sand.
*Crouching automatically grants the effects of crouching, regardless of current animation state. That means you could be mid-combo, hit b, and you'd still be standing up but no one would target you.
*For the early levels, level reset costs increase faster than you can get currency.
*+10% and +20% movement speed bonuses actually confer ten times that amount. At level 19 I was able to take every speed boost but one and go Sonic-level speeds.
*It's possible to permanently miss out on experience points if they fall off a cliff or into unreachable areas.
Keep up the progress!