Well, first of all, I can't say it's not original. While most of participants were fiddling with taking away control over player in their games, you built a damn reactor and put the player inside it. I dig this idea. Is it fun though? I wouldn't say so, sadly. Seems like it got lost somewhere between a clever "8 ball pool-like" take and more serious simulation game, it just doesn't fit and feel right in any category. And the controls doesn't help - especially if you're on a laptop, playing with a touchpad :P Nevertheless, there's a lot of great work put into this, congrats on finishing on time! :)

EDIT: Oh, I forgot to mention - you're hiding the mouse cursor and not showing it in the ingame menu, making it pretty unusable.

very cool and unique game, taking a real world concept and immersing the player in the experience! great job!

Very original take on the theme! I'm surprised I haven't come across more games about nuclear fission. Really cool concept!

This game puts you right into the action, I like it. felt like I was in science class again!  This one of the more unique games I've played, liked everything about it once I got a handle on the controls! 

Going to be controversial here and say I think that the controls are absolutely fine. I think they are just different from the norm, which isn't necessarily bad, just different. After playing for 10 minutes it was pretty natural, the only thing I found difficult sometimes was collecting the coolant as the speed was a little too fast to line up with it correctly.

I mentioned in another comment that the way the coolant works prevented me from completing the game for a while, as I had assumed that any neutron (rather than just my own) passing through the clouds would reduce the temperature. Once I noticed this, I was able to get to the end.

With those two points out of the way; I think this is my favourite game of the jam that I've played so far! I love how it puts you right in the middle of the simulation and allows you to influence it from the inside as well as the outside. I also think it's brilliant how all the particles are simulated and that lowering control rods into the reactor doesn't just adjust some weighting in the background, you can actually see the rods lower into the chamber and see that more particles bash into it. Awesome job!

The controls were a bit difficult to manage, but after a while, I got used to it, and the game was pretty fun. My only nitpick is that starting at a point where you are facing the wall sometimes took me out of the zone a bit.

I really liked this mouse movement, and the theme was really cool! I really liked all of the complexity and moving parts. Good work

I really liked  the unique idea of the game! It took some time to get used to the controls but once I got it I had a blast ;) Well done!