I think this game is really good, but I haven't found a single spider. I've looked both above and below ground, but it seems like they just aren't spawning. Just so you know, I played the web version; maybe there's a bug in it. I'll wait for the fix. :)
Edited: I launched the game in a different browser (switching from Chromium to Firefox) and the bug was fixed; maybe Chromium somehow breaks the spider spawning or something like that :0