One of the games of all time

This is certainly a game where you move and hit things. It even has a poorly thought out upgrade system!

Move around the screen!

That's right, you can move in this game! Too fast at some point if you upgrade all the way.

Hit enemies!

That's right, combat exists. Make the atoms decay into lesser atoms until they are lead 208, then smite them from existence as pb208 isn't useful to you

Collect drops!

Atoms drop radiation when they decay! Pick it up or get hit by it to collect. You can use it to upgrade yourself!

Upgrade!

There's an upgrade tree! Each upgrade improves your stats by an amount you don't know, and makes the enemies become the atom that you upgraded to! It also costs an amount of radiation unknown to you! It's a really obtuse system!

Lose!

You can't win! You will get swarmed and you will be forced to explode! Try to get a high score! There's nothing else to do!

Controls

WASD or arrow keys to move

left click or space to attack

Hitbox follows movement or mouse movement with mouse movement being preferred.