Cool auto battler with a bunch of items to choose from, good work on adding so many items that these games really benefit from. The graphics are simple enough but still deliver the gameplay well, Good job!
I would nitpick a bit for the game being a bit not too balanced, as getting a set of good items to start a run is quite difficult and luck-dependent. Based on that here are a few suggestions: Add a reset button (throw away bad runs), make the items randomise in such a way that at least some useful items show up from time to time (got a run with 3-4 levels with only mana effects without any mana upgrades), upgrades that increase the number of items shown in the shop, may add dice type (d4 is a good one to make weaker enemies)
Anyway, nice work and I look forward to play some more later!