I was in a bad mood when I wrote that review, forgive me. I've actually fiddled with making a game so I know how much knowledge you have to have in order to pump something this good out in so little time. Like I said, the idea is good and the art and music are cool.
I only played through once, so I can't speak too much to the difficulty ramp-up. It seemed alright - if you get really good at the sword it probably helps. I used the railgun first because it insta-killed; on another playthrough I'd probably upgrade something else because you don't get enough ammo/I never knew when more ammo was coming. I actually didn't see the ammo counter, totally my bad.
You can leave the tipping system up. That was unfair criticism. If people like it they should throw you some money.
On retrospect, I don't mind the pace of the game too much. It just doesn't always feel justified... like maybe his spelunking suit doesn't look heavy enough for how slow every action is. It's like the movement/camera controls in the original Resident Evil... you get the feeling that it's done purposefully for effect, but also it's just so frustrating.
I like this game more than I gave you credit for. It just didn't solve my bad mood at the time.