Great job on this. I only played it once, so I don't know if it would become more clear to me if I played it again, but I wasn't sure if there was something for me to do after collecting the skulls. A couple big enemies showed up that i struggled to try and kill, but then I died.
I like the music, but I don't feel like it really fit the mood of the game, plus the levels were a bit high and kinda covered the sfx a bit.