The ant you play as doesn't always stand out against the background making it difficult to focus on where it is after looking around the screen for your next route/target.
At the start of the game, you get attacked before you pick up any weapons, and while starting with nothing adds to the risk/reward feeling of the game, being attacked when you have nothing hurts a bit.
There were some points I played where you would be surrounded by enemies and could not attack quickly enough to escape, I really dislike the preying mantis, the first one I found was in a tight area with nowhere to go and other smaller enemies boxing you in further. You evade to get past the mantis to attack it and you get killed by the smaller enemies, you start with the smaller enemies and the mantis chops you up.
I understand you were aiming to make a souls-like game, and I think you have pretty much succeeded, but I also think that enemy positioning vs map area needs to be thought about. When playing, I don't want to be completely boxed in with no real way to defend myself.
I've played a few other games since yours, but I can't recall if there was an attack sound, if there is ignore this statement.