Not the worst i've played, but it's pretty close. The game itself doesn't feel complete and feels more of a draft.
The gameplay loop itself is bad, and is impossible to finish it without using the built-in hacks the developers put. The game forces you to "conserve" your ammo, but there's no way to replenish it besides hitting all your shots and not get hit, but that's impossible at higher floors at enemies start flying at you at sub-sonic speeds. You're greeted with instant death when you run out of ammo, ammo will run out at around floor 30~ if you're lucky (there are 40 floors).
The animations themselves are pretty mediocre, and there's barely any of them (3-4?). the enemies themselves aren't very difficult to deal with, the main issue of this game is that the player has limited ammo and it's very easy to burn through it long before reaching the top and there's nothing you can really do to avoid that outcome besides using the cheats.