Nice one! Visuals are really good and intro is super cute :D I agree about the common difficulty complaint, level 3 was too much for me ^^ It's such a shame considering how the 4th one looks like xD
What makes it that hard for me were:
- A little "floaty" car control, you vehicle can go a little sideways
- Camera not rotating with car, so I have okayish visibility only in one side...
- ...and its only okayish because bigger obstacles (trees, houses) obstruct the view and make it hard to spot barrels in front of you
What is fun in this game? Rampage! Destruction! Going fast and furious! Red barrels are in contradiction with that feeling (because they cause you to drive super-careful), so time based approach (where for example your challenge is to prioritize your targets and look for higher valuable objects to destroy) could make a little bit more sense.
But hey, you did manage to deliver a game that is working, very good looking and strongly connected with the jam's topic! So really good job! :D