Harmful elements: Acid (green), red square (enemy), spikes, boss (obviously) and spike boulder. Kill the boss by jumping on its blue part, each time you jump on it, one life less it has. Kill normal enemies by jumping on their blue part. Arrow keys to move. Touch the heart that appears in some levels to get +1 live.
My first platformer!! All mine, including music. Please if you detect any bugs, report. Can you find the secret live and the secret platform, both in level 1?