nice concept. maybe using the keys for the movements could be a bit more intuitive in my opinion  : i couldn't go past level 2 as it was making me spawn back at the entry as well. presentation looks very nice!

Using an arrow as a way to move is such a good concept. Also fit the limitation. It's just that the moving backward while shooting is not a good experience

I beat level 2, but spawned back in level 2. Does anybody else get that? And the spawning enemies in front of the exit is annoying

I liked how polished everything was, but shooting to move backwards felt more like an annoyance than a fun mechanic, but I think your close. If you move towards where you shoot you'll have to balance shooting towards and away from enemies to not get to close. Or instead you could put the player in between two enemy armies so players have to keep switching between which army they target to not move to close the other army. This rebound system would also work quite well if you had a bottomless pit behind you so you can't rapidfire while backed into a corner.