Nice game! I loved its game art and the amount of features it has! Some initial rounds seem extremely difficult to me. I also didn't know how to buy skills :,(
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You can buy items by holding the W key, it says so when you're next to an item you can afford. Maybe that text wasn't very clear or visible because it is pretty small.
Also definitely agree that some of the first rooms are much harder then they should be, we only had a bit of time to balance things out before submitting the game and I know the others who worked on it definitely want to make a post-jam version with the difficulty curve fixed.