Very fun game! Level 9 is super challenging, but i definitely think it is beatable. In terms of feedback, maybe having a tutorial to teach players about the space rewind. Also maybe you should grey out the heal button if you are at full health. Very fun game though, I really liked the progression system.
A 2d action game made by one person with little previous experience. That said, tear the thing apart in the comments, I'm always looking for feedback.
Press the full screen button in the bottom right of the game to play!
Instructions: Use WASD to move, use the mouse to shoot, Press Space to go back in time.