Thank you for the feedback! Sorry it took so long to get back to you; I appreciate you trying out the steam demo- I've got a lot of time in TF2 myself.
The terminal challenges are definitely more puzzle-like:so finding a perfect combination to "cheese" the challenge is the solution- purple shots, high speed green charges, but most importantly the red ability can snag you that vinyl. In the final game the difficulty curve will be much more gradual!
We've included an upgrade in the full game to increase the purple platforms by a good margin, in addition to giving you some extra airtime after firing - hopefully this makes using them a lot friendlier to players! Along with this there are also upgrades to help in combat but I don't think I'll be adding the trader or inventory system to the demo since the release isn't too far off.
All in all appreciate the feedback, I'll take a look and continue tuning some of the challenges. - cheers!