This is SO COOL! I took several tries to get a higher highscore. I fell totally in love with the fact, that this was no rogue like. That I have to buy the upgrades every time I die from zero to hero is such a great idea. And the sword swing mechanic is totally cool. In the first place I thought, I had to swing the sword by mouse movement against enemies, until I discovered the mouse click :D
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Thank you! Btw you don't lose any progress on death, your previous upgrades basically get turned back into money so you could buy all the same upgrades again. This is so you can change your setup if you like for each run. I just put out an update which adds a description and some other QOL features to make it more obvious.