Ohh I love this! Graphics and music are both flawless. I went in without instructions, so at first I didn't know you could combine items - I was wondering if all there was to the game was "hurl everything out of the bag ASAP and hope you get lucky", which worked for level 1, but on level 2 I put two of the same item next to each other and they merged! :O It was then I realized the true gameplay.
Fittingly, it was only on level 3 that I realized you could merge them a second time (found while shifting my inventory to clear a way out). The challenge of whether to save and merge items or throw them out half-merged, and having to account for if there's enough space to even get them out, made for a uniquely fun yet difficult gameplay.
Really, my only critique is that sometimes the game just kept spawning driftwood and junk at the opening! Stop picking those up, Edgar!! (And one time the last boss spawned an unmovable block on the opening and refused to remove it, which was rude...)