moonbus: configurable gravity

moonbus.p8

@@ -17,22 +17,24 @@ function reset()
     plr_transed=0
     plr_money=0
     plr_target={x=8,y=2}
-    plr_level=3
+    plr_level=4
 
     levels={
         {map_start=0,map_height=8},
         {map_start=8,map_height=8},
-        {map_start=16,map_height=16}
+        {map_start=16,map_height=16},
+        {map_start=16,map_height=15,gravity=0}
     }
     
     telem_spd={}
     
-    gravity=0.02
     engine_power=0.1
     fuel_cons=0.005
     land_speed_limit=1
-    mapy=levels[plr_level].map_start
-    maph=levels[plr_level].map_height
+    local maplevel=levels[plr_level]
+    mapy=maplevel.map_start
+    maph=maplevel.map_height
+    gravity=maplevel.gravity or 0.01
     bonus_docked=1
     cam={}