Nice frantic fun! The dash effect felt good and there was a good sense of progression as I turned into some sort of bullet-spewing god. Some odd decisions in my opinion:
-Being allowed to shoot enemy bullets makes it easier than it seems. With a few "bullets fired" upgrades it becomes hard to get hit by things that aren't wizards.
-Damage numbers showing the decimal places clutters up the screen somewhat. Rounding the numbers off would clear up a lot of screen real estate.
-It seemed like it was going to be a significant decision whether to buy an upgrade or not, but that almost immediately went out the window as I started earning much more gold than I could spend. At that point there wasn't much point in upgrades costing money at all.
-The energy bar seemed pretty much vestigial. I tried to empty it by spamming dash off cooldown and I was able to get maybe 10 dashes still. Not sure what's up with that.
None of these nitpicks significantly impacted my enjoyment of the game. Great work!