Good luck.
I couldn't think how to play it without my Wii-remote thingy.
Anyways, got that bastard (thanks for the tip!), and played further. It seems I'm now (again) facing a huge monster, this time it's the one with that little annoying man in it's blossom(?). So I shoot the eye, blossom opens, shoot little man, repeat, until the plant eats me without warning, or any QTE to avoid. Hmm.
Edit: Ok, seems like I just have to run away when the plant wants to eat me. Oh well...