That is a dang tough game. A rare remake that's somewhat on par with the original, difficulty-wise. It was very satisfying when I finally beat it.
Mine: Apparently, shutting down the plant-growth machine caused a lot more plant life to grow. Maybe I'm mad, but I'm not confident this will be explained, since nothing else has been. Explanations might be reserved for newgame+, based on TieTuesday.
I am glad to be at a boss fight finally, instead of repeatedly managing to pull off tricky grapples-launches... only to be rewarded by hard "You don't have this upgrade!" blocks. Seems like the wrong order to me. To add insult to injury, I'm *trying* to reach the Metroid-Prime style "Go to this room!" marker. It's just very unclear *how*- and the map at the bottom of the acid pool honestly did not help.
Anyway, shutting off the growth machine created a boss called Overgrowth, of course. It's initially not so bad, once your understand that it's invincible 90% of the time. Fortunately it randomly sends out a vulnerable eye-stalk which can be hurt, and I've gotten used to taking it down in two cycles. Still, pain in the ass to just wait there for several attacks until it decides to unfurl.
Because that's just the first stage. Now you basically have two platforms, and have to "shoot" (basically melee) the head just so, many times. It periodically covers the field with a swarm of energy balls, but that's okay, you can ride the random energy currents into the sky... Then fall blindly back into the battlefield. But eventually you'll shoot the plant ball in it's oddly bloody... brain... enough for it to die. Just takes a lot of tries.
Yeah no then there's a third form where it's just a floating mass of tentacles, each as long as your charge shot, that chases you everywhere, and you have to bounce between the ridiculously lift-currents.
This is probably the most melee-obsessed platformer I've seen since freaking Nidhogg. Except you have to leap between tiny platforms as you riposte, and there's a length boring section after every death.
Environmental Station Alpha. Sorry, but this boss is kinda bullshit.