Shootagon

You are a Blue Tennis Machine that shoots tennis but is absolutely blue. If you shoot the polygons that appeared, you will get EXP to upgrade yourself.

Your goal is to be the strongest Tennis Machine.

Instruction:

Press anywhere to shoot balls toward that location.

WASD or Arrow Keys to move.

Note: Moving with WASD cause some bugs so please try to use Arrow Keys mainly.

E to enable/disable auto shoot.

1, 2, 3, 4: To trigger upgrade.

M+1, 2, 3, 4: Auto-upgrade.

Double M to disable auto-upgrade.

Tips: 

Don't switch between classes when you are enabling auto shoot because the balls will cover the button and you can't press it.

Polygons' Descriptions:

Points: Extremely easy to break but they're so small.

Lines: Also easy to break but their thickness makes them hard to be noticed.

Triangles: Quite easy to break but this time it's very easy to hit them.

Squares: A bit tough only.

Pentagons: They are not fragile at all.

Alpha Pentagons: Mutated Pentagons that are even stronger than Pentagons.

Hexagons: Very hard shells so don't bother to shoot them if you are not upgraded.

Circles: Infinitely many sides make them the strongest Polygons in this universe.

Classes' Descriptions:

Triple: Shoot 3 balls at the same time. Their accuracy and reload speed are very good.

Burst: Shoot a big and strong ball make them hard to be directed but the reload speed is their downside.

Rapid: Shoot 20 balls rapidly but you will expect some missed shots. Their damage per ball is rather weak compared to the others.

Dual: Shoot 2 balls at the front and 2 balls behind your back. Their accuracy is OK, same for damage and reload speed.

Mutation:

Other than the Pentagons to Alpha Pentagons mutation, there are other mutations as well. After some time, the early Pentagons can be tougher than even the Circles and give you more EXP. So in the late game, try to shoot Points and Lines as well not only Hexagons or Circles but not 100% of them are mutated, unfortunately.

Touch the border will make you teleport back to the start point because I can't make the collision properly function. It might cause the polygons to disappear so don't attempt to do so.

All codes and artworks are done by me.

Sound effects are randomly created by "sfxr".

Soundtrack:

Tsuraran - Salty's Sunday Night.

The idea for this game is based on diep.io. Very cool game, definitely check out. This is just my pathetic attempt to recreate it.