It can be very fun to be able to cut the spider into many pieces many ways. However it can easily be killed by an arrow so this is not too useful. I think there should be a large meele type enemy which is a bit slow and has a lot of health. You can cut off an arm so it can maybe only attack with a weaker secondary weapon, you can cut off a leg then it becomes slower or stationary, so you can then use the arrow easily.
More large enemies.
The hammer bots are fun and it's good that they are fundamentally different. However I think there should be an option to choose between cutting off different parts for different results. Currently you can cut off the leg and then they move slower, but there's nothing else you can cut off for an effect as far as I know. I think it would be a nice addition if you cut off one of their arm they swing slower because the hammer is very heavy for one handed use.