How does your submission match the theme?
Moving helps you to avoid incoming enemies and stops your health from keep dropping.

Standing will make your health drop, but will recover your stamina.

Attacking gives you a health boost, gives you points and starts your combo count, but it has a cost for your stamina.

Combos, if high enough, have a multiplier effect for your points. Also they give you a small time window for you to recover stamina by standing without the health drop.

KokoRob's heart is not just there because of the theme; it's also a visual shortcut for the health meter.

The music (besides sounding awesome) also serves as a cue for the current health state (the music's volume drops with your health, while the sound of a beating heart gets stronger), and to add tension.

So basically: not only the game's mechanics serve a dual/multi purpose, they're also interconnected.
And we threw an example of an Adaptive Soundtrack as a bonus ;) (https://www.youtube.com/watch?v=b0gvM4q2hdI)

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Instructions:

Move with Left Stick/WASD
Attack with ABXY/Arrow Keys
Accept with Start/Space
Pause with Start/Escape

Third-party resources
Software:
Unity
DOTween
InControl
2D Toolkit
Spine (and runtime code)

Content:
Font: http://www.dafont.com/es/baveuse.font?l[]=10&l[]=1&text=1234567890

Contributors
Carlos Levario (Art)
Eduardo Dueñas (Audio)
Alejandro Guardado (Coding)