I enjoyed the game, BUT, there are a few errors I noticed.
1. If you replay the game (I think that is what caused it) you cant buy the attack speed upgrade
2. When you restart the game your money carry's over to the next game, leading to an easy round 2 win if you farm enough
3. When you replay the game (after beating the game you get sent back to the menu and can replay like that) the healing upgrades stay, using that I was able to get this run 