The legs on the lizard are great! That’s my favorite detail of the game. I found it a little too mentally overloading to think about which scale to switch to when thinking about their powerups and their level. I usually just stuck with one scale I leveled up a bunch. Although sometimes I would panic and spam all the scales I could.
I was able to beat the nephew nightmare (feels like my nephews made that level), but I just rushed it and took advantage of the invincibility frames to get through it.
By the way, the music slaps. Your brother did great with that.
Great job overall!