I'm not very sure - I just don't think you can follow the Tartarus vibe to heart - after all, it is only one half of the Persona game, meaning the player has been involved with a
lot of talking to people, increasing their Social Link and advancing the sidestories, so they go "enough messing around; now I'm prepared to go for some hour-long monster-whacking at Tartarus".
However, if you're following through with the design, I would say keep the number of enemies (perhaps add 1 more), but add some very strong enemies to appear in the Red Ghost sprites alone, with very high HP, strong attacks and maybe high defenses and a specific weakness to exploit; on later floors, you can include it with some smaller enemies alongside. This kind of "mini-boss" enriches the gameplay by adding different kinds of battles and keeping the single-target spells relevant (god I was
so glad I got the "Flame" spell when I did! XD)
On that line, if we were talking numbers, with your current floor design I would say 6 regular enemies and 2 "mini-boss" enemies. In the end, all I'd like to see is for you to get rid of those 5+ enemy encounters.
I did forget to add to my review (but it's something I think I commented on your blog) that I'm pretty darn amazed from your use of custom graphics. This is a really big deal and you should be proud of it because very few users go our of their way to do this, especially if this was for NaGaDeMo. Kudos on that!
