Jump and run is always fun. My score showed 0 when finishing the game (even though I collected all strawberries and killed all enemies). When jumping, you often clip to the higher ground which feels a bit clumsy. The levels' difficulty progression was good, but you should not let the player jump into the unknown (last level). Always show the next platform - either at the edge of the screen or by showing later parts of the level while you play - so that the player can prepare for the next jump.

I didn't understand how it is connected to "death is only the beginning".

Good start! I would add some variation to the music, maybe alter the melody for a few bars etc.