Is it happening with every enemy you ran into, or just one specific enemy? If it happens with only one, then please post a screenshot with its location.
Thanks. I found the problem and fixed it (Hopefuly). I will upload new version in about 10 minutes (0.38.2 - beta). Download it and simply overwrite your old game folder with this new one. All your previous saves and unlocks should stay and work. Write again if that fixed the issue or if it's still broken.