There's an issue regarding the physics of the game (never forget that the game has to ~feel~ real).
You're merely decreasing the time between the ticks? (The hamster's turn-ability wasn't affected by it's speed).
+1 for the custom graphics; it has a decent feel to it
+ 1/2 for managing to make polygonal hitboxes
Keep at it; practice makes perfect! (Just never forget the ~feel~)