Hahahahahahha, that's a funny one!
Simple. finishable, good mechanic "the more you take, the slower you are", intense.
The thing I'd add is maybe some sort of debuff besides heaviness. After some point in the game, when you collect enough of speed-boost, you almost fly from one side to another even with 3 barrels. x) Just widening the screen and spawning barrels closer to the edges would do the work and game will have the same amount of intensity throughout the whole gameplay. :)