Fun game, quite enjoyed it, really chaos on the next level, the ringing sfx was fitting, gameplay-wise it is great, i haven't experienced any bug whatsoever, and the artsyle is nice and looks polished. There are a few things that can be improved, like the upgrade buttons, it is quite small and i miss it, if i didn't read the others comment about this i might have missed it completely, you can also add a highlight of the clicked building so we can confirming where the ambulance or the firetruck actually go. Aside from that, the game is already good and enjoyable. good job!