Interesting. Which browser are you using? I can do some testing and see if I can recreate the issue. It is worth noting that you need at least $25 to place a cone, and you do have a cone maximum. So, it’s possible that one of those requirements was the reason (the UX definitely could use some improvement to indicate this, though 😅).
Removing cones is a bit janky. You have to hold down right click while not mousing over a cone, then - while still holding down right click - drag onto the cone(s) you want to remove. It’s not great 🙃 Once the jam is fully over, I’d like to push a fix that makes this much more intuitive.
Regardless, thank you so much for trying out the game and leaving feedback! I really appreciate it. I’m glad you had some fun even though you ran into a few issues :)