Hey heckos! Currently working on the mouse input (essentially, I had to write my own cursor because when Unity frees the hardware cursor, the WebGL view lets go of the mouse and you have to click the canvas again).
I just noticed the exact issue you're describing testing something else; I'm working on all woes mouse-related atm before jumping on wrapping up the game, so the bug report is very welcome :)
Thanks for playing and stay tuned!