First of all I love the concept. Had been wanting a game like this for a while. Definitely looking forward to the full release!

Feedback:

Ship combat can be a bit of a grind. It takes a lot of shots to down an enemy ship. The actual combat isn't hard but it gets very reptitive. I think it would be less tedious, and more fun if enemy ships took less shots to kill but did more damage to you as well. Also the Shield Recharge should probably be in the center of the ship instead of in the rear on the disintegrator.

Ground combat currently feels pretty basic since the Main character doesn't have very interesting abilities. They are pretty much all just do damage or do more damage. Where are moves like stun the enemy for X turns, or multitarget attacks, or healing move? They enemy AI can also be very annoying where it seems to get stuck only attacking one target over an over. With no healing spell this get's frustrating making you waste all bandages. Can also make breeding difficult if only one girl ever get's attention.

Harvestors seem out of place at the moment. Since your mostly moving planet to planet with no reason to return. Maybe rework Harvestors to be part of endgame content, and have early game give more of the resources as loot.

Suggestions:

Not everyone enjoys Futanari. But your currently missing out on a source of lifeforms if you don't take the body mod. Maybe an alternate mod could be added to allow Urethra penetration, and Bladder Pregnancy instead? Intestine Pregnancy, and Anal/Oral birth would also be something that could be added. Maybe rework Belly penetration to be an endgame upgrade that has a chance to impregnate everything.

The body mod system also looks like it may need more upgrades along the way to last 8 solar systems. Maybe upgrades that allow the main character to mate with different lifeforms successfully. Bigger vagina to handle larger monsters. Toxin resistance to mate with poison monsters. Would also be neat to be able to develop synergy with Parasites or Tentacles so it becomes a benefit to be infected. 

I would like if eventually each species gets unique birth animation's, and you can unlock the ability to give birth to the full monster instead of unknown life forms. I don't know where the story is going but maybe there would be an option to side with the Infected, and intentionally breed monsters?