Thanks for playing!
Interesting - when a bunch of my friends and I play tested this, none of us had any issues with the spikes, so I didn't think they would be an issue. That said, someone else also brought this up on the game's page after I posted it, so I might make them more visible anyway.
As for the second bit, I just played it a few more times and I think you're right. In theory, the sounds that the turrets made before they shot were supposed to warn the player and allow them to retreat back into cover or prepare to dodge. But in practice, sometimes the turrets would spawn right around a corner or at the end of a passageway and ambush the player, making them impossible to avoid.
I'll be experimenting with the turret parameters post-jam for sure. Thanks for the feedback!