The ejection seat fired upwards, only some
idiot would put in a seat that fires down!(F-104

)
The He 162 was made largely of wood, and was designed to be built by relatively unskilled workers. It had no armour for the pilot, and only 2x20mm cannon with 120rpg.
But, it's performance was mostly superior to the Me 262.
Speed at 30 second thrust: 553mph @S/L, 562mph @20k, 525mph @36k.
Speed at normal thrust: 491mph @S/L, 521mph @20k, 475mph @36k.
Initial climb rate: 3780fpm, 1950fpm @20k, 315fpm @36k.
T/O, Landing run was 930yd and 1072yd.
Wingloading: 51lbs/sq ft.
The big killer is low endurance, only 20 minutes at sea level! That could be extended to about 1 hr at higher altitudes though.