Hi Hohenstaufer, thank you so much for the appreciation it means a lot to me :)
Yes the respawn is totally intended, there are gameplay and narrative reasons for that! In 2021: Moon Escape I tried to create a gameplay that push the player to do ammo and life management as much as possible, sometimes kill an enemy could not be your best option... but they could spawn life recharge if they die! So you have endless life sources but limited bullet. Additionally in every moment you can teleport back to your ship from the map menu section and fully recharge ;)
This mechanic anyway could be used to your advantage sometimes... because you can have control on the position of the enemy - I will say no more ;)