The animation is very SMOOTH, the game play is simple and works effeciently, could be AMAZING if expanded further.
The envioronment is suprisingly well decorated and pretty, the sound effects are basic but not annoying(I'd suggest trying a pitch shift, where the pitch slightly shifts every time a sound effect is played making variety)
I feel like with how nice all the art and sprites is, making the enviorement more interactable, weaving between rocks, blowing up things enemies might be using as cover, etc. That's just a random suggestion tho, I really do like this game and your animation and art skills are VERY solid. I would love to see this expanded further!