Enjoyment: I had fun as long as Gus lasted, did not get very far since I understood to late how to use the iron bars.The melee combat felt a bit off but nothing too bad here.
Gameplay: Compared to other entry a rather more controls, but not really difficult to get a grasp of it. Only critique point I have here, is the inventory scrolling by using a mouse wheel. Its a bit awkward in web build, because you need a extra click to focus the window again and maybe someone is playing it with a laptop or mouse without mouse wheel (although this scenario is probably exaggerated).
Innovation: Played a similar entry to this - gameplay wise nothing to new, but nice story bit, which probably can be further deepend.
Theme: Setting implements the setting well, while the, i guess, colosseum is not the strangest of places the attacking creatures certainly make it one.
Visuals: Consistent art style, nice choice of font, only problem I had was with the UI - at full screen messages at the bottom were cut-off by about 1/3.
Audio: Nice underlying background music, solid choice for sfx. Nice job