Interesting concept for sure, I'm really not very good at platformers and with grappling hooks in general (you'd think growing up with 8 arms and 2 tentacles would make me a natural with grappling hooks, but for some reason I've never been able to take advantage of that), so I struggled to get positive outcomes. I do wish the timer was a little more apparent, and that there would be some sort of unmissable warning as you're getting low on time. I did sort of figure it out 4 tries, but ultimately that problem likely rests more on me than it does your game design.

I couldn't figure out what the point of the different colored foxes were, not sure if I just missed something or if it's not readily apparent, but I ended up not using that feature since I couldn't figure out what it was doing.

Despite my apparent complaining, I actually thought this was rather well done, I imagine this would be a lot of fun for folks that like platormers, and I feel like there's a lot of potential with this sort of game loop. I think the message came across pretty well in the dialogue, but was sort of lost in the gameplay, but that really only matters specifically for this jam. Overall, well done... Oh, and I love the CRT effect!

This is really neat, bonus points for providing a Linux version. I wasn't able to test out the multiplayer, but I can imagine it being fun with how the levels were designed. The basic gameplay is simple but really entertaining. More levels could be a great way to build further on this, if you want to update it. The setting makes for a nice Robin Hood-like story. The only criticism there I'd have is a really highbrow nitpick, in so far, as that it seemed a bit weird to me that I am going out collecting resources for a post-capitalist society... which were diamonds and precious metals, things explicitly valued not primarily for their use value but their exchange value and scarcity alone. Ironically, the radioactive barrels might have been the things most valuable as proper resources (OK, the mysterious crystals maybe too, and technically, there could be anything in the safe). 

But that is a minor complaint, the game was really fun, hope it will get more eyes on it. Great job!