Really fun little demo! The core gameplay loop feels very satisfying, somewhat reminiscent of 'the king is watching', while still holding as a unique take on the genre.
Looking forward to seeing what direction the game takes with new content and systems, I'll be wish listing on steam once you put it up!
Two issues to report with the build also:
One is collected ores sometimes get stuck mid-animation and remain on screen for the rest of the session. Couldn't 100% recreate it, but seems to occur when quickly going from day to day.
The other is performance drops on higher waves, or higher speed settings (running in browser.) Its hard to tell, but it might also be the case that performance drops effect the simulation outcome. If I set speed to higher levels on wave 50+, the game would drop lots of frames and the weapons seemed to be firing less than if I would let it run normal speed. May be worth checking if any of the simulation is tied to framerate.
Best of luck with the project!