This was fun! Reminds me of dark souls in that the quickest way to die is to focus too much on attacking, you're better off focusing on dodging and getting your attacks in only when it's safe to do so (I am so bad at dodging.)
Controls feel awkward but maybe in a way that fits the vibe. I am a hapless slow purple blob outmatched by giant alien terrors.
My current strategy is just do put the cursor over the 'third leg' and move the character around to ensure I hit the right limb. Don't know if that's going to work for later bosses, but for now I'm glad it does because I don't think I'd be able to hit a moving target...