Bonk.io

Bonk is a multiplayer physics game, for up to eight players at once. Pushing your opponent off the edge of the level, the last man standing wins!
Fight with your friends or anyone from anywhere in the world in the last match

[Arrows] keys to move
[X] key to make yourself heavier
Stay on [screen] key to survive!
Hold [x] key to brace before a collision with an enemy, but while holding x you are much less manoeuvrable.
To bounce yourself higher, press [down] key on the way down, and [up] key on the way up!