Blue X World

Play as male or female X with different abilities and get more power, skills and weapons during your adventure on the unknown planet. Fight through 14 ground - air - falling - water and underwater stages! Survive challenging bossfights and collect enough energy crystals to save your species. Transform into GravBall to change gravity, absorb enemy fire and a lot more!

Source: https://zarkonnen.github.io/SwissGamesShowcase/bluexworld.html