I'd say it passes for a game model. Any model is usable for games as long as the game developer knows what they are doing with it, but I can see your model being used in games, especially those looking for that style of creature.
Some critique, though please take it with a grain of salt:
- It is very shiny, at least from what I saw in the CGTrader pictures. I would recommend lowering the shininess a bit. I might also suggest adding a normal map, even just a simple noise normal map, to give the skin some micro texture to help reduce the uniform shiny look.
- While having three heads looks really cool, it means all three heads have to be animated, which may be a negative from a game development point of view if animation time is limited. That said, the multiple heads can be a pro if the project is looking for creatures of that style, so I'd say it is a trade off. I noticed you included animations, which is a huge plus!
- For me personally, the positioning of the limbs does not look very natural. The limbs are at right angles like a square, which looks a little stiff. This does make it easier to animate though, and to be fair some animals do look like this, but it looks a little "blocky" to me. I might suggest making the angles with the limbs not quite right angles, perhaps making them just a tad relaxed and not quite in line with the body. (That said, my art skills are rather lacking and anatomy is not really my thing, so it may be perfectly fine and the issue is entirely on my side)
- The polygon count may be a tad high for games that intend to use the creature at a distance, though the topology is good so making a low-poly version shouldn't be too difficult. I'd not worry about it too much, but something that may be worth considering in future models.
I would say the model definitely has potential to be used in a video game. The topology is consistent and the polygon count is evenly dispersed throughout the model, both pluses that make using the model in games a lot easier.
I would say it definitely has potential and it looks good. I've tried making creatures before and I found it was more difficult than I initially anticipated. I think you have a solid model that can be used in games, it just needs a project that is looking for that type of creature. Good job!
