I have played one "luft-like" game before, which is jet lancer. I feel like one crucial thing that jet lancer has and this doesn't is that outrunning your enemies is pretty simple to achieve, always. so you set up opportunities to safely kill chasers. whereas here it just felt unfair, a sort of gamble. and a hit and run game loop. basically, it is missing the fun. I think flying enemy design(movement, attacks, or both) should(maybe) change, but your movement kit has to change for sure, to improve the fun.