The game is pretty good, I like the progression but I feel like giving the players a currency only to then limit the player to purchasing one item feels a bit redundant. I get that not all power ups are made equal and this shows that but there were a few times I got lucky, had the money for multiple power ups and couldn't get them. I know that's the point but I'd rather have no money so it doesn't feel wasted or for a way to carry my money back to buy upgrades before i start the run.
Moving onto a different point, I feel like the enemies are a bit too quick and tanky. I'm not the best player so I had a bit of difficulty outrunning them (Maybe it's just a skill issue but I think someone else mentioned it)
I find that the upgraded attack eith the mage when you're firing two orbs is rather inconvenient to aim. If they're close it's fine, but you're trying to keep some distance and it just becomes kinda odd to aim. I'd say you should change it to firing twice in the same direction and increasing how much it costs to balance it