I love the concept, and any game that starts with a button labeled "become sentient" gets a good laugh out of me. The pixel art is also really good, and I love the idea of using the explosion as a second jump.
However, I'd consider removing the rotating camera. Other than making me very dizzy, it also messes with the controls whenever you end up upside down. It also feels rather weird that heroes (and enemies) still spawn when it says there's 0 of them left.
If you do want to keep the feel of being thrown around, maybe consider upping the knockback on everything?
Other than that, the game was pretty good! I'd love to see this expanded with more enemy and hero types, or something.