if you can only add in three enemies, add in:
The girl archers, for eye candy, for inspiration on the look of the girl archers look to the ps2 gam shadows of rome- there is girl archer enemies in that game that would look muy bien in vr- and the archers would make players actually have to dodge arrows instead of just chopping and lopping enemies.
The snake enemies to scare some people and make a challenge since they are low and im tall, so slicing low would be a challenge for me, which I like
The minotaur, which could be a slightly upscaled regular dude but in metal minotaur armor thatll scale up to atleast 6 foot 5 (im 6'1) and if you can get me to go ooh shit this thing can kick my ass- you did something right.
Also, adding in more armor types (get inspiration from actual gladiator armor from the roman republic/empire) would make the enemies unique without having to make more variations of enemes model wise.
If you have atleast 3 enemies, voiced heads, more weapons, more realistic arena, more armor, and actual hands holding the weapons, then id drop 20 or 25 on the game easy.
Also, i'm into film, and i'm doing a 'realistic vr' series where I dress like the game characters in vr games and play the game and record it- and your game will be the first one I do on the channel.
Ive been having my friends try gorn and they all love it! Its very addicting and with some more work- it could be a very good seller.
Make sure you actively try to get it out there though, as that will be the hardest part. Luckily there Is not much vr games for the htc vive out there now, but as the vive gets more cheaper, and people buy it by next year (February of 2017 it'll probably hit its peak) then id release the full version by febuary if you want to maximize profits for it before a lot of 'big budget' games come out for it by march, which I want you to do since that means there will be a better gorn 2 lol