Oroboros

Game description:

Oroboros is a classic dodge-n-slash game. Rack up insane combo multipliers, slice enemies into pieces, and be nimble with your mouse! The gameplay is at first simple: Some things will hurt you, some will help you, some will do both. Avoid the stuff that hurts, and collect the stuff that helps!

You can buy upgrades to evolve your creature, the gameplay will be different depending on the upgrade path you choose.

Game controls:

Use the mouse to move, spacebar for bombs. Left-click retracts your tail.
M key opens menu.
P key pauses the game.