Have you thought about adding new enemies? For example, german shepherds (ovcharka). Dogs are well suited to the setting.
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I always want to add more enemies :)
But its quite a lot of work to make the graphics for it and therefore also quite expensive. But I might get back at it and put a new one in! I kind of wanna put a boss in. Might try and do that at some point.
I like the idea of a guard dog, Ill keep that one in mind. Would also be a good mixup with what is there already