Thanks so much for playing and the detailed feedback! New music and an 'alert' that lava was rising were both on my todo list but got their priority lowered by other ideas.
On the eyeball thing - I get the sense from your feedback that you were trying to time rocket jumps at the eyeballs. You can just land on them, no rockets necessary, and it'll do a hit of damage and propel you up. Once you jump on them twice they die and you get a rocket back. I'm super curious if that's the case, and what I could do to teach jumping on eyeballs or make it apparent somehow.
Putting CHOP on my list to play, thanks again!