Low health

local last_call = globals.TickCount( );

function draw_health_alert( )
    local local_player = entities.GetLocalPlayer( );
    local w,h = draw.GetScreenSize( );
    if ( local_player and local_player:IsAlive( ) and local_player:GetHealth( ) < 27 and globals.TickCount( ) - last_call > 54 ) then
        draw.Color( 255,0,0,183 );
        draw.RoundedRectFill( 1, 1, w, h );
        last_call = globals.TickCount( );
    end

end

callbacks.Register( "Draw", "drawhealthalert", draw_health_alert );