Hey, thanks so much for playing, commentary like this really helps us improve the game!
The artillery cannon briefly disables the lane you fire it in, but we failed convey that at all. We chose to limit the amount of chaos it gave you for this reason, and the result is that it feels pretty weak and unsatisfying.
At ~5:32 in the video I was clutching that you would land on the semi, because you can do that to gain a bunch of chaos, but understandably you avoided it, because the game already taught you that semis should generally be avoided.
I've got some ideas for how to improve these things based on your gameplay, and a new item ending in '-atling gun' may appear in the next release! Thanks again!