No screen tearing here, but maybe try playing in a Window instead of full screen?
Also, in regards to doors you can’t open and puzzles, the more familiar with the game “world” itself and the puzzles you get, the more you’ll find you get out of each run. For example, the first time you realize how to recognize and open a specific type of secret door, you’ll find them every time you play and open them with ease, getting a ton of free loot that early on you are probably walking right past.