Not enough.
I like the graphic design of the characters and enemies. I even like the level design and the interface idea. Although I will suggest a different group of buttons aside from 123456, or in fact allow players to assign their attacks to their own buttons. Especially when the case is that I only have four fingers, and they don't naturally span 6 keys. It actually feels awkward. QWE,ASD would've been a more suitable choice in my opinion.
The levels were far too basic and for a side scrolling platformer, there just wasn't enough in the level design to make it interesting. No jumps, no different platform heights, no collectibles, NOTHING. It's just one direction, and endless attacking with no diversity whatsoever. After 2 or so levels, it becomes utterly boring. The level design needs more diversity. It needs more ideas. Not just one plane of attack and movement.
The skill tree was very good. I liked the skills very much and how they balanced out on the defensive/offensive idea. It brought a good element of skill choice into the game, whether to go all out offensive or all out defensive or try and find a balance between the two.
The levels were short and repetitive, and so were the enemies. They just had more life but their abilities and attack patterns were similar. There's no skill required in this game, and it's not a button masher either. It's just empty. The boss fights were the only interesting bit because at least they had some challenge to them.
There's not enough in this game to call it 'action-packed'. It clearly isn't. But the design and the skill management and idea is enough to warrant this a second attempt.