that was a fun game
I just have three things i wanna say
1. l had a really hard time getting the special power to work, it might just be my slow computer but the game was running at at least 16 fps and i usually had to hold space a long time before it would work
2. The potions were hard to reach, i think you should make keys that give you easier access to the potions, like 'e' uses your first avaliable health potion, 'w' uses a haste potion if you have one, etc.
3. The money wasn't well balanced, i couldn't afford anything but health at the beginning and after that i was able to buy all the items within about 4 levels and then i just started collecting money, perhaps you should have items that increase certain stats like attack speed and stuff especially because i didnt feel like stat points increased them fast enough