The puzzles make use of the main mechanic, but the game itself is quite hard to play due to bugs and unexpected behaviours. As @bryengx has said, the game has potential, but you should work on polishing the round edges of your project:
- Grabable boxes can get out of bounds and dissapear if you are not careful when moving them around
- Grabbing an item should be a toggle in my opinion
- The controls feel a bit rough, specially crouching
Make sure to fix those things as the concept of the game is cool! 😊