Jake Cloer is maker of Asakae and he really needed something for abreaction. The result is this fun when shooting never ends.
The Earth is again under attack of some aliens and you are nameless soldier travelling to the front line. Forget the book about survival you won’t make it. You can shoot and crawl to avoid being shot but the enemies like grenades a lot and this one is hard to avoid. However, you have unlimited lives, the only limitation is in time and I don’t know if there is even winnable scenario. The enemies change from time to time but the content is generally the same all the time.