Radioactive Decay

A 2D endless platformer where you control a radioactive atom. Your goal is to survive as long as you can, while trying to dodge/kill enemies and avoid decaying into lead.

The game's controls are simple: you jump by pressing the W. That's it.
Your atom has 4 states: Uranium, Radium, Radon and Bismuth. Each one has different attributes and abilities which you can use!

This is the first game I've ever made, so it's obviously not perfect. I sincerely apologise from everybody who has to look at my ugly art. Also, there are some bugs here and there (like falling through some platforms or simply not dying...).
I appreciate any kind of feedback/idea/criticism/anything as long as it can help me develop my skills!