Hehe nawh sounds fair to me :) The enemies do more damage to you the closer they are when they shoot you so trying to take them out from a far is sort of encouraged. I think this is how most old school shooters done it and yeah I think it works pretty well, puts you a bit on the edge if the enemies start getting to close to you.
Yeah I thought about adding in some mechanic for strafing but I think it would be quite cumbersome given the playdates controls. It is designed so you can overpower an enemy by continously shooting at him he wont have time to fire back as long as you keep shooting him.
I have some plans for a new enemy though which will be bigger and more brutal that will require some more tactical approach to kill :)