Polycle

In Polycle you are with a shape (3-8 angles + circle), and your goal is to get as much points as you can. You just collect coins, level up, and buy stuff to make getting points easier.

When you start a game you start with a triangle. With time you get points and get new shapes. With new shapes you can destroy more enemies and get coins, and xp. With coins and levels you can upgrade yourself and get more points.

When your shape becomes a circle it can kill any enemy. With time it will reset to a triangle, and you progress to the next wave where enemies are faster.