To be fair to Capcom they did a lot of good with this HD remaster of Resident Evil 0. You have to conserve your ammo, look for herbs and always decide if running away is better than trying to stand and fight. The core game is still that of classic Resident Evil.
While Resident Evil 0 does have this new mechanic. It is actually quite well done and I feel that Resident Evil 0 has some of the better puzzles in the series. It is not uncommon to have Rebecca doing one thing somewhere, Billy another and the two coming together for one puzzle. This is done very well and the two of them can work together to do puzzles. This swapping feature is a huge part of the game and you will have to use each character’s strengths to get through the game.