Cannot you destroy the enemy with your vehicle? Physical vehicle damage? Can you put just a little animation in the friendly characters, might be asking too much.. Underwater dungeons? All in all, the game is great! I lost track of time playing it. Reminds me of nontendo 64 days, this would be one of those must own titles, great job man!! PS - I'm sure someone already asked this... but what about a pistol whip?
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You can kill enemies by hitting them with your car. The rest of your suggestions, I'll keep in mind. :D