My strategy is to build a ton of wall so they have go through mazes of tentacles while being shot at by my towers.
About the sex, what would you think if it was deactivated by default and the player would have to actually order them to have sex, instead of it being automatic? That would be more work for the player, but also less struggle with the AI and more strategy-like.
A few features are missing, probably explain why it's seem a bit harsh. Basically playing map will grant a currency to use to buy upgrades with weird powers.
I'll try to tone down the difficulty and the waves. I guess playing it so much makes me immune to its toughness at this point :O
Thank you a lot for your feedback!! I'll do my best to improve every one of these points UwU