Thing-Thing Arena Three is a evolution of the prior sets of Arena trails for the Thing thing series- a survive
"shoot your enemies and avoid them, and if you run out of amo hit them with a crow-bar" sort of game that requires you to shoot enemies with a gun, supplied with a customizable character and a set of achievements and a need to shoot enemies and kill them efficiently
"with style".
It's a rather addicting plat former styled shooter, and I request you play it blind. But if you really want to come to this game 'prepared' then play 'thing-thing four' for a little bit and get used to the feel. (Or the original thing-thing. I care not.)
And yes, you can give your character something similar to a Trilby hat. I know I did. :3
The link: http://www.crazymonkeygames.com/Thing-Thing-Arena-3.html