Nice entry, congrats! Controlling an enemy it's an interesting mechanic, especially because it gives the player the abilities of that enemy, opening to a lot of strategies. It's a small thing, but I appreciated how you used two healthbars to signal the status of both the player and the controlled body: it's a simple trick to remember that you have some kind of protection, but also that the protection can fall off, and that's perfect for the "parasite" theme!
At a certain point, I had some difficulties with the combat mechanic. I wasn't able to understand how the enemies were moving, and at the same time I felt like that the game was asking me to predict their movements. I don't know if that was your intention by making a turn-based game, or if you planned to make it real-time, but it turned out different. Don't get me wrong: uncertainty is good in games, and that's only my perception; anyway, I hope that the feedback might help you in some way.
Overall, great job. Congratulations :)