This is an ingenious idea! Like holy moly I never could have thought that turning a crafting/merging simulator into a tower defense game would work so well
Kinda softlocked my game though after accidentally turning my only crafting table to an excavation site XD, would also be cool if we can stack/separate items since currently seems like there's no way to do that.
Would love to see even more polish (game lacks sound effects & general oomph to the game feel) but the base for a promising future game is there! I want to see it developed further, great job!