Thank you for the feedback,
the attack/damage feedback is already fairly pronounced by player animation, sound and ui simplicity/scale. Note that if you were running the WebGL version these may not load properly due to natural difficulty of porting to Web in Unity - I recommend playing the downloadable version.
We were and still are planning on implementing shaders and player-centered environmental lightning. Due to lack of time and energy we couldn't risk this aspect breaking the game. Same goes for the guidiance, we prioritized level design and did not have time left.
Hope we'll be able to bring you update(s) relatively soon :) I'm glad you liked it.