this is a very fun game!! i love it i could prolly play it for hours (i played for 1) this could definitely be a mobile game as well!
(i played the web version!)
if this does get an update or a fanmade splitoff then some recommendations based on assumptions (im not a coder or anything close) if its not already being done
-have the previous map data deleted after every new area
-make the calculations for the wepeons/city turn into a flat number during the drive area
-push the titans further back and add new mobs (maybe something that slows down the city)
-add different game options such as increase the rate of diffuclty speed and increasing base difficulty for each new area, or one that increases base difficulty based on how many new areas youve gone to (this could be a paid feature if it was a mobile game, go cheap as it will be mostly 6-12 years olds playing, less is more)