Cool idea! It's not the first "carry only one" game I come across, but I love how you give it an explanation by saying the hero forgot his backpack. XD So, yeah, that's a nice game. Kinda regret the controls aren't displayed on the screen, though.
The controls could be shown on pressing the "?" button. It is shown on messages area when the game starts, but now I think I should've made it more intrusive. Thanks for your feedback!