Pros:
- Genuinely fun to play
- Clever level design
- Simple, intuitive controls
Cons:
- Janky physics
- pushing boxes while standing on top of them
- getting stuck on box corners
- Sometimes it feels like I'm using an exploit to beat levels
- Last level (where the box needs to be pushed into the small hole in the ground) is not nearly as fun as the previous levels. It doesn't require puzzle-solving skills - it tests how lightly you can tap 'A'. For me it took the most tries with the least reward for completing it.
Suggestions:
With some SFX, better art, and improved physics, this could be a phenomenal puzzle game. Additional mechanics such as boxes that don't stop moving after you stop pushing them and other traps (falling stalactites, spikes/sawblades/dart traps - typical things you'd find in a cave ;), and maybe something that destroys boxes - this could also be used to remove boxes that are in your way).
Best of luck!