With a bit more polish this could got from its current "pretty fun" to "I need to keep playing this". Apart from some more instructions on the combos as other have mentioned, some hooks to make the player want to play again would make a good addition. A high score (longer the combo the bigger the score), longest combo, highest wave, etc.
Viewing post in Ninja Impact jam comments
Hi,
maybe you remember this game jam entry ? As some people told the idea was good and deserved more polish, I took some time to try to improve it and just published a brand new version (adding score, better audio, etc.). You can check it out here : https://wavering-systems.itch.io/kungfu-impact . If you're not interested at all, sorry for the bother !