Very cool, this is wonderful to hear! ^v^
I actually modified the barrel and crate to be open containers with the idea that there might be pins placed inside them, but I more or less put that on the backburner to work on other things. Those modifications are why I didn't list them as premade assets in the submission page.
I guess this is also as good a time as any to mention somewhere that there is indeed a secret in the game, and nobody seems to have found it yet. To anyone reading this, have a look at the credits screen for a hint (well... basically a giveaway actually, lol).
Thanks for giving it a go!