first off : This is all very professional quality.
It looks very nice, but some things do need improvement if you're planning to sell this baby
The models are awesome, but they need a better path tracking system (they keep getting stuck in the levels etc).
Also, the levels look alright, but can be a whole lot better (try using alot more models instead of blocks). The levels do have a nice atmosphere, but can be more detailed.
Furthermore, the game plays very good, I really like the inventory, and this game sure has alot of pro potentional

Keep it up!