Took a lot longer than I thought to add in but I added in controller support to Carpoon. About a third of people had issues with the WASD controls with W going forward, so I added in an option. Here's how the buttons map:

Steering: Left stick

Aiming: Right stick

Gas: Right Trigger

Reverse: Right Bumper  (added in rounded edges to hopefully make reversing less necessary)

 Shoot harpoon: Left Trigger

Release Harpoon: B button

Aside from that, I've found a lot of silly variables that I setup initially that were breaking the game when switching between a Windows EXE and HTML5, which I've fixed. The player's truck can turn faster now, and there's the start of a physics rope when launching the harpoon.