Glad you had fun! Thanks for playing!
I did have some really inefficient code checking the wheat harvesting logic, which I ended up optimising a bit, but it definitely needed more. Performance does require a reasonably beefy machine with browser hardware acceleration.
If you are interested, the AI is pretty basic - essentially, the harvester spins in 5 degree increments and it has about 100 forward looking points. Every rotation increment, it counts if there is wheat available there, and if it has the most it has seen, it stores that angle for its next launch. Very simple stuff
Also the name "Simulator" was just a parody/joke of the genre, not an ACTUAL simulator (kind of like the famous game Goat Simulator) :-P
The harvester spawner/bomb was also my favourite powerup!