Played a good bit of games here with bad jumping mechanics but you really nailed yours. I will say though I wasn't really sure what was triggering my health loss once the boss spawned I just seemed to lose most of my health regardless of what I was doing at the time.
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Thank you for the feedback, it is good to hear that the jumping seems fine!
Well, the bosses might be a bit too strong at this point and prolly the combat system also something that may need to be reworked a bit!
You can lose health 2 ways though: if the small enemies reach one of the sides, or if you are in the attack range of the boss an it hits you.