Comment by latexr

I second (from another comment) the suggestion for CARRION. Think of it like those 80’s movies where an amorphous creature is captured/created and stuck in a lab. You play as the creature, trying to get out.

https://store.steampowered.com/app/953490/CARRION/

Also, not exactly playing as the bad guy but Enemy Mind is a fun tangential concept where instead of having your own ammo and life, you’re constantly possessing enemy ships and using their resources, before discarding them for the next one.

https://store.steampowered.com/app/285840/Enemy_Mind/

Coincidentally it’s now with 60% discount and it’s worth it at that price. If I recall (it’s been many years since I played it) the game was short and didn’t have a lot going for it outside the gimmick.