Ok, first game, first experience. The gameplay idea is pretty simple and can enjoy for a while, but there isn't anything which can make me fun after several minutes of playing. What you can try to do?
- Make the usage of the ability more tactical. Now I can spam it internally.
- Make different enemies with different AI and abilities. You need 2 or 3 to make the game better.
- Add a scoring system to stimulate player play more, as it's the easiest way to set a goal to a player.
- Add HP to a character don't kill him with 1 hit.
Despite getting such feedback, keep trying, game development all about self-improvement! I wish you luck in this endeavour.