Pretty cool concept. Essentially a doom clone, which is actually pretty rare to see, but the pregnancy aspect is not very obvious.
Levels are decent, though they are VERY red. The tunnels are relatively interesting to explore with a good amount of twists and turns. Wouldn't mind seeing a keycard or two, but it's hardly important.
Enemies are plentiful. The imps are a lot stronger than you'd expect imps to be damage-wise, but given how much faster the player is, said damage is easily avoided so you never feel forced to trade hits. I'm assuming if there were other stronger enemies, the imps would have more of a weak-swarmer role.
Music is great, fits the theme and feels very doom-like. Graphics, same thing.
The imps do grow larger when shot, but it's not very noticeable from a distance and the lighting kinda blows out their outlines when facing a certain direction (south/southwest?).
When they're downed it's not very clear that they're resting on their bellies, and looks more like they're covering their bodies with a cloth or something. It's also quite difficult to see the animation that plays when imps are downed due to the player's weapon usually being pointed in a way that blocks the view. One thing I noticed is that the imps shrink back down right after being shot, no idea if that's intentional or not but figured it was worth a mention.
It's probably out-of-scope for the game jam, but something like a player-preg mechanic could add a bit more depth by giving the player a choice between strength/tankiness vs speed/dexterity? That or having it be a visual representation of the player's health, so the player is essentially just as vulnerable as the enemies? Not sure how it would work given the doom-like perspective, but just throwing the idea out there.
Overall a very solid start for a game that I would like to see expanded upon.