Loved watching this one develop and where you've arrived at now. Excellent representation of the theme, and quite tricky to beat levels above easymode!
Really enjoyed the blocky sprites, the fire dissolve, and all the particles.
The minimap bug I'm 99% sure is due to fullscreen mode in the browser. Source: it works when not in fullscreen. I'm guessing it just doesn't know how to translate those coordinates when it's expecting a tiny window and you give it a massive one!
Awesome job. Great tutorial too, lots of people never made it that far with their submissions!