This game is great. It's one fatal flaw, I believe, is that at no point in time throughout the game do you generate gold fast enough. Enemies simply do not reward enough gold.
Absolutely great game. The music was inspiring, the combat system was impeccable, the art was beautiful. Where in many games, people die and they say, "Oh, screw it, I quit," dying in this game only spurred me on even more to win. I give this game a 5/5
Okay, it appears as though the laser boss disappears when he kills you, or so it happens for me, and I've tried it on all the modes and so far I've only seen it happen on Medium mode. I hope this info is helpful.
Thanks :) Glad that you enjoyed the game!