Not bad for your first game.
For this being your first game, it's definitely better than what I've seen from other users who've submitted their first game (e.g me) There were some slight problems with the game, but it's alright overall. Let's see, shall we?
The art / graphics: It's a sprite game, so since it's technically "not yours" I can't comment; however I can say that the quality of the sprites were good.
The animation: The animation is good, the movement of Kirby and the enemies are smooth enough to not look choppy; however, there is a slight note: when Kirby goes off the ground, there's an animation of him blowing up into a ball, right? Now when I press space to shoot, he goes back to his normal size, and then it doesn't show him transforming into a ball again. When going back to the ground, it doesn't transition from ball to Kirby shape again, it just shows Kirby. It's not initially noticeable but if you look closely you'll know what I mean.
The sound / music: There are no sound effects for the throwing of the blades or the sound of the arrows hitting Kirby, or anything at all; the music was good, but it was quickly annoying as it was the only thing that could be heard, and that too was repetitive and high-pitched at the end...it's a little annoying :\
The concept: It's your average joe "defence" game, in that you just have to defend some targets from reaching the left side of the screen, but we don't even know what IS the thing that is to be defended; we just have to shoot for the sake of it.
The gameplay: It's simple, and as you said, the gameplay might be basic but it gets tough real quick! I noticed some things, though: you can't press and hold spacebar to continuously shoot, if you press the directional key buttons (i.e you press and hold spacebar, press up, Kirby does not shoot anymore). I don't know if that's intentional or not. The powerup that looks like a banana or something that gives you blue blades kills almost every enemy in one shot, what's the point of shooting enemies if that's all that's required? Apart from that though, everything else was okay. Here's a small suggestion, though: Why not allow the player to let Kirby collide with the enemies so that they die, but some health is lost? The powerups would not be affected that way. Oh, and when can the instruction menu / preloader be added?
All in all it's a pretty good game but there's some little issues here and there, but if you fix them then it'll be good. Oh, and I know absolutely jack squat about Kirby so I don't know who meta knight is...
~~ Summary ~~
~~ Good points ~~
1) Not bad for first game
2) Smooth animation
3) Simplistic gameplay
~~ Bad points ~~
1) Annoying music
2) No sound effects
3) No preloader / instructions (apart from AC)
4) Space key...bug?
[Review Request Club]