Thank you for your feedback. That area with the lava pit is rough because sometimes random things off-screen can hit you on the way down and knock you into it. After listening to some feedback, I had thought about switching that to a pit of spikes where you might get hurt 2-3 times, but you would have an opportunity to jump out and not die instantly. Another thought is to have a difficulty setting and maybe use the lava pit map for the harder difficulty and one with spikes for the easier difficulty, so you can choose.
I suppose the knock-back time could be decreased a bit as well. There are times where it feels a bit too long. There is also an invincible time as well, which could be increased a bit to recover from a hit.
Great things to think about!