Overall a decent level in my opinion, the only mistake I found was some cutoff, but it's just something minor so even Erik could fix it.
Warrior's Thicket:
I though this was a pretty fun level, but it had some issues:
You can easily skip part of the level by going up the wall at this part (or get stuck if you're not careful enough):
I'd recommend moving this hammer bro up some tiles and maybe give the player a little bit more room to dodge his hammers since otherwise it's pretty difficult to get past it without getting hurt:
My hacks: Justice for Mario / Unnamed Kaizo Hack