- The game's map does a great job of filling in points of interest as you go along (switches, health pickups etc.). Don't be intimidated by the number of secrets in the game, they'll be clearly marked on your map and none of the puzzles are particularly difficult.
- Don't bother backtracking to clean up collectibles after finishing an area unless you're really struggling with the game's combat. It's pretty tedious to do multiple times and there's a very obvious point where you can clean up the map before the final boss.