Thanks for the feedback! And you're right, at this moment it doesn't make much difference to pick up another type, especially if you're under 5 energy, if you're over that amount and pick up another energy type then you get penalised because the energy gets back to 5.
The thing is I had in mind making a rare powerup item that would fill up the entire energy capacity, but I just way too tired to make it before the deadline T.T, so yeah, after I add that in the game, the energy types will have a lot more sense, but for now you're completely right!