Thanks for trying it out!
Regarding the laser, how would you make it more spectacular? Also yellow particles are unfortunately a no-no. To complete the game's atmosphere, it is entirely monochromatic and any yellow particles would be out of place.
Regarding the enemies: I am not an artist. I am very, very bad at animating, and chose the game based off my abilities. I wouldn't really be able to pull of what you said.
Regarding the HUD: What do you mean? also you can press shift to hide the HUD (turn the layer to zero opacity).
EDIT: also, how long did you play? to get up to level 6 should be quite difficult...
Maybe I need to make it a bit harder to activate the lift?