I apologise if this isn't a very good description. I THINK that this game was on the classic xbox.
I can remember that one level was snowy and another was in a sort of circus. What I can remember from the snowy level is there was a large angler fish blocking the entrance to a cave which you need to dispose of before you continue. From the circus level I think this is the boss battle. It was a large platform with others connect to it and the boss was a large clown(maybe) that was balancing on a ball which you had to defeat.
Another feature that I remember is ever now and again a red circle would appear around you and enemies would spawn and in order to proceed you had to dispatch them all, also I think that the level selector was a sort of free roam area and you had to get keys(or something similar) to proceed to the next level.
If anyone knows the game I'd be very grateful, this has been annoying me for quite a while now and I would like to play it again.
Thank you.
-oA