I like this interpretation of the limitation. Sometimes it feels like you're vastly under-powered when you're up against 3 enemies. But then you smack 'em all and feel SUPER powerful. My one nitpick is that when I faced two enemies and killed one, I still ended in a draw because I didn't defeat the other enemy. Seems a bit punishing since you can lose all your coins quite fast to start with. Would have liked to get coins based on kills rather than round wins. I also liked the available upgrades and actually felt like they made an impact!