The Spider Portal is Useless

I've actually seen a ton of people using it all the time, it's not exactly unpopular. Not the most fun gamemode to work with imo (especially on harder levels) since it's basically like a ball but straight up and down without any delay, which makes coordinating taps/clicks to avoid dying much more stressful and annoying (although if creators actually cared a little more about gameplay and making it smoother and easier to read, this might not be as much of an issue as I've found it to be).

That's just my personal thoughts based on experience over years of play, though, and everyone else could have gone through something completely different - doesn't make the spider an objectively bad gamemode in the slightest. Another factor could be how often you yourself use it, for example; back when the wave was new I didn't like it very much at all because its precise angles and slower movement felt harder to control, but as I kept playing I adjusted and now it feels like the wave has always been there

it has its use, but yeah it's just a rehash of the ball but more annoying. There's only so much you can do with a 1-button game tho. The robot was the same issue where it's just a cube with varied jump heights

I feel like spider is a better version of ball.
And its not really useless.