Cute game! I didn't really understood what giving my friends did, but I did it anyway xD. The game was a bit easy, but maybe that's with the power of selling friends =p.
Nice little entry overall =)
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Thanks for playing, appreciate the feedback!
I actually tuned the game to be a bit on the easier side on purpose; since we didn't have a ton of time to test and finetune, we just decided to make it a little easier and make sure to avoid too much frustration.
Sacrificing friends increases your damage and your rate of fire; since I decided to go without a UI for it, I tried to make the upgrades quite powerful, but still I realize that, with so few enemies, it can be a bit hard to notice the change.