Detect obstacles based on layer properties.

collision_layer

--DETECT OBSTACLES ------------------------------------------------------------
local obstacle = function(level, locX, locY)
    local detect = mte.getTileProperties({level = level, locX = locX, locY = locY})
    for i = 1, #detect, 1 do
        -- I forget why I check the tile property...  
        if detect[i].tile then
            -- does its layers property solid?
            if layers[i].properties and layers[i].properties.solid and detect[i].tile > 0  then
                detect = "stop"
                player:pause()
                return detect
            end
        end
    end
end