This is Bananattack.

Snowball is a sidescroller in which the player assumes the role of an elf with a vengeance!

Gameplay utilizes snowballs in clever ways. Roll snow around, making colossal snow boulders! Crush children under their massive weight! Use the snowballs as convenient platforms! Ride snowballs downhill for quick transport!

Temperature also has its role to play, as you can only make a snowball where it’s cold, and snowballs melt in the heat.

It was made for a Winter contest in 2005 hosted by TomT64.

Remarks: Very fun, but on the short side. Even by compo standards.
Genre: Sidescroller
Credits: Overkill (project lead, code, level design), Darien (artwork), Ustor (code), Actionsketch (code), Troupe (music)